Here is my update:
First you have to navigate the ArriveCan app. Good luck! It took 4 times, but eventually I got the acceptance. Finding a way to get a covid pcr test and get the results within the 72 hour window before entry is a challenge. A local urgent care boasting rapid results was completely useless for me. I used CVS drugs in Detroit, who accepted medicare. They said results would arrive in "2 to 5 days", which did not fit my needs. However the results actually arrived at about 30 hours. Good.
Arrived at the Ambassador Bridge entry in Windsor. Showed passport, and the guy pulled up all my stuff from the app immediately. "Did you get a test?" "Yes" (he didnt ask to see it.)
Immediately went to the "weapons snd booze" questions, commiserated about the silly ArriveCan app. and wished me well.
Total time at the gate about 2.5 minutes.
The fussy part is before you get there. Get your test early as possible. Once approved, it is not a problem entering Canada.
