This has been mentioned NUMEROUS times on the forum but I will mention it again.
Your PR status and PR card are completely different entities. Your PR card expiry has no bearing on your PR status and needless to say, no bearing on your SIN, work in Canada or your Citizenship application.
https://www.canada.ca/en/immigratio...-immigrants/pr-card/understand-pr-status.html
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Yes, you can apply to renew your PR card now.
https://www.canada.ca/en/immigratio...ces/new-immigrants/pr-card/who-can-apply.html
Also, if you factor in the current Covid-19 related processing delays, we might be looking at much more than 12 months of processing time.