I got this response from IRCC regarding my GCMS notes after sending ATIP an email to enquire about the status.
Thank you for contacting the Access to Information and Privacy Office.
We acknowledge that your request has been received and is in processing. According to our records, your request was due on October 14th, 2020.
Although we make efforts to provide timely access to records, the large volume of requests our institution processes makes it impossible to determine the exact date your file will be ready.
Please note that we have flagged your request as priority and the information will be forwarded to you as soon as possible.
We apologize for any inconvenience this situation may cause.
Regards.