Didn't even know this thread existed, happy to contribute my experience as well.

Landing on KL flight and being in business and with NEXUS, we were the first at the three kiosks set up around CBSA (very confusing walking in front of agents if you have NEXUS). There is a LOT of paperwork, as I understand the first stop is to link your ArriveCAN with the Alberta Pilot. Luggage was coming out when we got to the belt, grabbed that, left customs, and filled in some more paperwork (a consent form). Then went to another desk where they confirmed all our details and printed out the two requisitions (one for immediate use, one a week later). Did the test and left. I was actually out of the airport within 30 minutes of landing... But I also know that if there's a bunch of pax in front of you, you're SOL. Be quick.

Sunday did the second test at my local Shoppers. No issue, and got the result overnight today. The results are sent on an annoying "Private Post" platform and are very confusing to read. Also don't expect a certificate-like result that could be used for further travel or to show your employer. It literally just says First Middle (no Last) swab taken at XXX was Negative.

Definitely an awesome project.