Assuming that when they issue you the COPR it has validity to Feb 2022, you must 'land' - what you're calling 'present documents' - before that final validity date.
Pre-covid would be a simple matter to depart and return 'to move' later, but still nothing technically forbidden about that. (Also note that despite the language, IRCC is providing extensions in some cases now due to covid, but temporary measure).
Note that getting/having a PR card in order to fly back to Canada after this initial landing may make planning a bit difficult on precise dates/present logistical challenges.