As of now(crossed border via peace bridge in the last week of July, 2021), you need a PCR test result (within 72 hours). Also create an entry in arriveCan and let them know when are you planning to cross the border. It will also ask details regarding your vaccination records. They will do another test at the border and there is website for border test result so it is faster if you have created an account on that website. I don't remember the name of that website. For more details, please google it and they have a good explanation on their official website
You have to have two vaccines. USA PCR listed in the cnd website. Results must be negative 72 hours before leaving name date birth results lab and phone with results. You must make an arrive can app download place you are staying 14 days. Then once you arrive at the border .passports. vaccine proof PCR negative the border decided if you are exempt. It is what choice they make I can't say they can guarantee approval or no govt quantine. I did not know about switch health until I got to the border I had to pullover register and get a swab. I then was told with a negative PCR from the us and two covid 19 shots prior mine were the same not mixed. I went home. I waited for my result I was exempt my test was negative. Each person is different you must check the cnd website for changes. Please note cnd border can decided no or yes even if you do all this it's their job to enforce changes. I was confused but glad I had not had a hard time I was nervous.always check the website cnd ..ty
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