Hi. I’m Canadian. Our border is open to international travellers who are vaccinated, without requiring quarantine, as of yesterday. Refer to the article in this post: Canada Re-Opening in mid August - September
Thankfully you’ve had an excellent sitter already, so repeat your radar for red flags and all should go well. Be clear with the sitter as to your expectations, especially with how often they connect with you. I’ve done a sit where the owner said the pet had anxiety issues. When they came home, and I had to stay overnight, the dog left their room and settled on a spot half way between the two bedrooms (and they were far apart). The next day the owner said she realized she was the one with anxiety issues, not the dog. 