Canada is working on letting in US fully vaccinated citizens on Monday (9th Aug), and other vaccinated foreign nationals on 1st September.
COVID-19: Entering Canada requirements checklist – Travel restrictions in Canada – Travel.gc.ca
There is a little hiccup though ... Canadian Border Forces intend to strike.
A PSAC news release says travelers "should expect long lineups and lengthy delays at border crossings and airports."
“Our members at CBSA have been on the front lines throughout the pandemic, and many have contracted COVID-19 while working”
“Now it’s time for the government to step up for them the way they’ve stepped up for Canadians.”
Canada border travel could see delays due to employee strike