Question: My probationary period passed three days ago, I have not been told if I passed it, and I have my evaluation early next week. Should I assume that I have passed probation?

Answer: 
Check your contract. As a fellow Canadian, usually when I've seen probation contracts, the probation period is set by a specified number of days, not by an evaluation procedure. If that's what your contract looks like, then congratulations, you passed!

I have never had a formal meeting in any job to discuss passing probation; I have only had such a meeting when I failed it. If you are confused, you should ask your manager, but your manager will probably think you're being silly (not in a bad way, just in a "isn't it obvious?" way).
Judging by the fact that you haven't been let go, I'd say you pretty much have but I'd wait for an official word from your manager or someone higher up. Usually you should be invited to a meeting to discuss your performance.