The border is open for non optional reasons. I doubt travel would qualify. Everyone - including Canadians who are returning - must have a negative Covid test within the past 72 hours AND go into quarantine for 14 days.
Travel between the lower 48 and Alaska is a bit different - but the travel must be for non optional reasons - like moving. And the rules are such that I doubt it would be much fun. You can check for updates here -
https://travel.gc.ca/travel-covid/tr.../border#alaska