Vegas Canadian--1) and 2) since you are not traveling until after March 1, I suggest you wait until March 1 and see what is formally announced. Things seem to have a way of changing and what the rules are going to be after March 1 are not at ALL clear to me.

You make your application for EHAS approval no MORE than 3 days before your flight.

3) Here is a link to testing facilities on island . Link

The past couple of times, we have used Medwork and are extremely satisfied with their service. You make an appointment, they are prompt, they are courteous, you get your results in under an hour. Highly recommended. Many people have used the proctored Binax Now telemedicine test to enter the US. I do not know whether that test is acceptable to enter Canada or not.