Hello,I would contact IRCC and see if you can be classified as essential since you have a COPR. No harm in asking. I wouldn't book a flight until you hear back from them. And it might take a while to hear back since I think they are being flodded with email. There's an email in the link below.
https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19/travel-restrictions-exemptions.html
According to the below notice, Permanent resident applications approved before Mar 18th are exempt from Travel restrictions.
https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19/immigration-applicants.html#approved-before
I booked my Air India flight via the Vande Bharat service for 20th May and will be coming to Canada. You can do the same.