Thankyou @legalfalcon
Most applications are experiencing delays. This is largely due to IRCC experiencing massive backlogs and operational difficulties due to COVID.
It all has to be do with IRCC and the processing delays at their offices. In the recent meeting of the Parliamentary Committee on Immigration and Citizenship, the deputy minister has acknowledged the delays. Also, recently additional financial resources have been allocated to IRCC to tackle COVID.
Another reason is that many applications are pending approval as even if the PPR is issued, you may not be exempt from travel restrictions.
To read the transcript of the meetings, see https://www.ourcommons.ca/DocumentViewer/en/43-2/CIMM/meeting-10/evidence