A:AnswerShipping is normally as fast as you can afford, fastest being next-day shipping. Free shipping seems to take around 3 to 5 labor days (weekends do not count). This iPhone starts shipping September 24, 2021.
A:AnswerGo to the Canadian Best Buy webpage to select you preferred new iPhone on your preferred carrier.
If you buy it from the American Best Buy webpage, you will have to choose with an American carrier which have the option of getting 5G coverage in Canada but only with the correct plan option, which would typically add $10 from the base plan option (I.E., select an unlimited plan for $50, and then add Canada and Mexico coverage for $10 more, which is a total of $60).