So I walked over the Rainbow bridge yesterday.

Uber from BUF was $39. Be sure to get dropped off at south side of entrance (by US CBP) and "made in America" souvenir shop as sidewalk is on the south side of bridge.

Funny seeing a steady stream of people hop out of Ubers with their suitcases and walk to bridge like I did. When I got to canadian side there were 6 people In line in front of me with 1 agent working. Took about 20 minutes of waiting, then my turn.
Questions asked were about my quarentine plan, declarations and what I was doing in US (which I replied "I don't feel the need to tell you that," he didn't seem to like answer but did not follow up). Told him I'm vaxxed he didn't care. Then a kind agent walked me to COVID test tent to do test. Make sure you preregister an account. Them my SO was waiting in the parking lot 25m away for the drive.

Interesting note, agent didn't care my SO was picking me up to drive me to Toronto but seemed worried I was staying with mother even though it's separate basement apartment.