My niece is married to a Canadian. They live in Washington State and his parents live in Vancouver. He said it is a little bit of a hassle but better than the year and a half they couldn’t go at all. He said they go about once a month to visit or for other reasons (dropped their pets off for a month while they were in Mexico, and then had to retrieve them), so it is doable, but that the self tests do not meet the requirements.
I think once they are there it’s not an issue.