Be careful!!
My clients have been pretty successful just saying "I didn't get out of my car, just handed the documents through the window", but some have been given self quarantine anyways.
For people who who have both vaccines, you should be able to avoid quarantine.
Yesterday, a client of mine was given self quarantine with both vaccines. This despite even Toronto Mayor John Tory stating on TV today that "you will not be stopped entering Canada if you are Canadian with 2 vaccines".
He is trying to get an exemption through Health Canada (let me know if anyone needs to know who to contact) so hopefully he can avoid it.
With the border "opening" in August, this should stop being a problem, for fully vaxxed anyways, but in the meantime, we shall see.