Canada tours now open beginning September 2021
Tauck today opened the Canadian tours beginning September (October for the polar bear tour). There is a disclaimer on the tour description page saying that they may have to alter the itinerary due to COVID restrictions. Travelers will be informed of the changes at least three weeks in advance of the tour departure - that's after you've made the final payment.
The Tauck travel requirements page gives the Canadian and American requirements for travel (fully vaccinated, test going and coming back, etc.). It doesn't mention the Canadian requirement for a quarantine plan. I'm going to ask Tauck what their quarantine plan is or if they will be providing one. I will report the results in this thread.
Most Canadian tour dates have openings.