In this article, I will try to explain how you can check&list to scheduled concurrent manager from back-end on our database

To find all of the scheduled requests connect as apps user to your database and run the SQL statement below:

SELECT fcr.request_id 
, fcpt.user_concurrent_program_name|| NVL2(fcr.description, '(' || fcr.description || ')', NULL) conc_prog
, fu.user_name requestor
, fu.description requested_by
, fu.email_address
, frt.responsibility_name requested_by_resp
, trim(fl.meaning) status
, fcr.phase_code
, fcr.status_code
, fcr.argument_text "PARAMETERS"
, '------>' dates
, TO_CHAR(fcr.request_date, 'DD-MON-YYYY HH24:MI:SS') requested
, TO_CHAR(fcr.requested_start_date, 'DD-MON-YYYY HH24:MI:SS') requested_start
, TO_CHAR((fcr.requested_start_date), 'HH24:MI:SS') start_time
, '------>' holds
, DECODE(fcr.hold_flag, 'Y', 'Yes', 'N', 'No') on_hold
, CASE
WHEN fcr.hold_flag = 'Y'
 THEN SUBSTR(
 u2.description
 , 0
 , 40
 )
 END last_update_by
 , CASE
 WHEN fcr.hold_flag = 'Y'
 THEN fcr.last_update_date
 END last_update_date
 , '------>' prints
 , fcr.number_of_copies print_count
 , fcr.printer
 , fcr.print_style
 , '------>' schedule
 , fcr.increment_dates
 , CASE WHEN fcrc.CLASS_INFO IS NULL THEN
 'Yes: ' || TO_CHAR(fcr.requested_start_date, 'DD-MON-YYYY HH24:MI:SS')
 ELSE
 'n/a'
 END run_once
 , CASE WHEN fcrc.class_type = 'P' THEN
 'Repeat every ' ||
 substr(fcrc.class_info, 1, instr(fcrc.class_info, ':') - 1) ||
 decode(substr(fcrc.class_info, instr(fcrc.class_info, ':', 1, 1) + 1, 1),
 'N', ' minutes',
 'M', ' months',
 'H', ' hours',
 'D', ' days') ||
 decode(substr(fcrc.class_info, instr(fcrc.class_info, ':', 1, 2) + 1, 1),
 'S', ' from the start of the prior run',
 'C', ' from the completion of the prior run')
 ELSE
 'n/a'
 END set_days_of_week
 , CASE WHEN fcrc.class_type = 'S' AND instr(substr(fcrc.class_info, 33),'1',1) > 0 THEN
 'Days of week: ' ||
 decode(substr(fcrc.class_info, 33, 1), '1', 'Sun, ') ||
 decode(substr(fcrc.class_info, 34, 1), '1', 'Mon, ') ||
 decode(substr(fcrc.class_info, 35, 1), '1', 'Tue, ') ||
 decode(substr(fcrc.class_info, 36, 1), '1', 'Wed, ') ||
 decode(substr(fcrc.class_info, 37, 1), '1', 'Thu, ') ||
 decode(substr(fcrc.class_info, 38, 1), '1', 'Fri, ') ||
 decode(substr(fcrc.class_info, 39, 1), '1', 'Sat ')
 ELSE
 'n/a'
 end days_of_week
 , CASE WHEN fcrc.class_type = 'S' AND instr(substr(fcrc.class_info, 1, 31),'1',1) > 0 THEN
 'Set Days of Month: ' ||
 decode(substr(fcrc.class_info, 1, 1), '1', '1st, ') ||
 decode(substr(fcrc.class_info, 2, 1), '1', '2nd, ') ||
 decode(substr(fcrc.class_info, 3, 1), '1', '3rd, ') ||
 decode(substr(fcrc.class_info, 4, 1), '1', '4th, ') ||
 decode(substr(fcrc.class_info, 5, 1), '1', '5th, ') ||
 decode(substr(fcrc.class_info, 6, 1), '1', '6th, ') ||
 decode(substr(fcrc.class_info, 7, 1), '1', '7th, ') ||
 decode(substr(fcrc.class_info, 8, 1), '1', '8th, ') ||
 decode(substr(fcrc.class_info, 9, 1), '1', '9th, ') ||
 decode(substr(fcrc.class_info, 10, 1), '1', '10th, ') ||
 decode(substr(fcrc.class_info, 11, 1), '1', '11th, ') ||
 decode(substr(fcrc.class_info, 12, 1), '1', '12th, ') ||
 decode(substr(fcrc.class_info, 13, 1), '1', '13th, ') ||
 decode(substr(fcrc.class_info, 14, 1), '1', '14th, ') ||
 decode(substr(fcrc.class_info, 15, 1), '1', '15th, ') ||
 decode(substr(fcrc.class_info, 16, 1), '1', '16th, ') ||
 decode(substr(fcrc.class_info, 17, 1), '1', '17th, ') ||
 decode(substr(fcrc.class_info, 18, 1), '1', '18th, ') ||
 decode(substr(fcrc.class_info, 19, 1), '1', '19th, ') ||
 decode(substr(fcrc.class_info, 20, 1), '1', '20th, ') ||
 decode(substr(fcrc.class_info, 21, 1), '1', '21st, ') ||
 decode(substr(fcrc.class_info, 22, 1), '1', '22nd, ') ||
 decode(substr(fcrc.class_info, 23, 1), '1', '23rd,' ) ||
 decode(substr(fcrc.class_info, 24, 1), '1', '24th, ') ||
 decode(substr(fcrc.class_info, 25, 1), '1', '25th, ') ||
 decode(substr(fcrc.class_info, 26, 1), '1', '26th, ') ||
 decode(substr(fcrc.class_info, 27, 1), '1', '27th, ') ||
 decode(substr(fcrc.class_info, 28, 1), '1', '28th, ') ||
 decode(substr(fcrc.class_info, 29, 1), '1', '29th, ') ||
 decode(substr(fcrc.class_info, 30, 1), '1', '30th, ') ||
 decode(substr(fcrc.class_info, 31, 1), '1', '31st. ')
 ELSE
 'n/a'
 END days_of_month
 , CASE WHEN fcrc.class_type = 'S' AND substr(fcrc.class_info, 32, 1) = '1' THEN
 'Yes'
 ELSE
 'n/a'
 END last_day_of_month_ticked
 , fcrc.CLASS_INFO
 FROM applsys.fnd_concurrent_requests fcr
 , applsys.fnd_user fu
 , applsys.fnd_user u2
 , applsys.fnd_concurrent_programs fcp
 , applsys.fnd_concurrent_programs_tl fcpt
 , applsys.fnd_printer_styles_tl fpst
 , applsys.fnd_conc_release_classes fcrc
 , applsys.fnd_responsibility_tl frt
 , apps.fnd_lookups fl
 WHERE fcp.application_id = fcpt.application_id
 AND fcr.requested_by = fu.user_id
 AND fcr.concurrent_program_id = fcp.concurrent_program_id
 AND fcr.program_application_id = fcp.application_id
 AND fcr.concurrent_program_id = fcpt.concurrent_program_id
 AND fcr.responsibility_id = frt.responsibility_id
 AND fcr.last_updated_by = u2.user_id
 AND fcr.print_style = fpst.printer_style_name(+)
 AND fcr.release_class_id = fcrc.release_class_id(+)
 AND fcr.status_code = fl.lookup_code
 AND fl.lookup_type = 'CP_STATUS_CODE'
 AND fcr.phase_code = 'P'
 AND 1=1
ORDER BY fu.description, fcr.requested_start_date asc;

Referance:

How to Determine Scheduled Concurrent Requests [ID 170107.1]