Update - received a letter. The quick expiry date is because the letter says to mail a photo with your UCI number and the letter so you can officially be sent the actual PR card. The restriction at this point would be that you can't re-enter Canada on a commercial vehicle if you do leave until you either have the PR card itself (which says it could be delayed due to COVID circumstances) or a PR travel document. Fingers crossed the PR card itself doesn't take too long to actually come so we can travel back to see my husband's family in the US.
I do however believe you could likely apply for a SIN and OHIP which is great news, I would assume you just have to show proof once you actually have the PR Card.