That's a good update, it appears Montreal visa office is awake for PGP files.
Last year August, my mum completed her medical for supervisa at IOM clinic in Abuja. The process was pretty straight forward with online appointment booking and confirmation after applicable had been received. She paid 40,500 naira for the medical. According to her, the service was great on the scheduled day.
See their appointment scheduling portal for either Lagos or Abuja here:
https://mymedical.iom.int/apps/omas/#_frmHome