For sure it wouldn't be before you receive your AOR for the PR application.
AOR's seem to be taking about 4-6 months to get.
IRCC told me a few days ago that they are now only issuing OWP's (included with spousal sponsorship PR applications) after the applicant receives their AIP (Approved In Principle), and if this really is the case, you're in for a long wait - 6 months or more.
I'm a March 2020 Inland applicant and I'm still waiting for my OWP...