Lucky your application didn’t get returned because of the missing NBI clearance. It should be included on the application since you spent 183 days in PH. Anyway go secure it now because it will take more than a month to get it.
I’ve been calling the hotline almost every week, reached out to my MP, inquire the status using webform and request for GCMS notes. Now finally i have oath invite! (Only the oath invite is true). So be patient and it will come (within a year).
Submit your application stating you need the letter from them (IRCC) for the request of PCC in Singapore. Once you have your letter and processed the PCC then submit it back to IRCC.
Just refer to the applicant spreadsheet to see the estimates when to expect the next step but it varies depending to each applicant and the office processing your application.