That’s great that he is tryin got limit your exposure. The problem is if he brings it into the home... unless you are both doing your best to limit travel outside the home you’re still at risk.
Yes, especially with my 87 year old mom. He uses Lysol before he walks inside and I disinfect every day. It's amazing how much trash dogs and people bring in in one day. Mom is staying in her room more and has her private bathroom.