Before I answer the delay part, we need to understand how GCMS notes are released.
GCMS notes are released under the
Access to Information Act. Section 7 of the Act mandates that a federal agency should release the requested information (here GCMS notes) notes within 30 days of requesting it.
However, ATI Act, also provides for extensions in certain case or a complete refusal under section 26.
However, most GCMS notes are delayed due to one of the following:
1. Administrative delay - Mostly in cases where your application has been transferred outside Canada to the LVO.
2. You application is at the final stage and awaiting approval - Here IRCC will prioritise the approval over releasing GCMS notes.
3. The application is under investigation and the applicant has been called for an interview - IRCC will not release the GCMS notes until the interview is over since it does not want the applicant to know the reason for the interview, so that the surprise element is not lost.
4. Refusal under s26 - Very rare, but does happen
When the GCMS notes are delayed, all you can do is request IRCC and follow up with them or file a complaint as specific under section 30 of the ATI Act.