Up here they can't get themselves organized enough to make a consistent policy on vaccine passports. The "proof" from the vaccine center is a full-page sheet of paper that could theoretically be carried but... meh, nobody's enforcing it yet. Test results are sent by text message so I could show my phone... though I dunno whether it would be anything like the border, where they can't order you to unlock your phone but if it is unlocked, they are authorized to search it.
We also have an election today, so that is another reason to be happy to be out of quarantine.