If you have a few weeks before your card expires, you should have been on the ball and started the renewal process months ago; it's advised to renew 9 months before expiry due to the variations in processing times in a post-COVID world. (Mine expires this September and I filed for renewal at end of last December and they just acknowledged my request last week.)
I'd get right on it. HOWEVER, keep in mind that you will still have PR status, expired card or not - the card is purely a travel document, so if you don't plan on traveling, you'll be fine until you get the new one.