Following this as well.
Our only option in Northern Ontario is thru the Health Unit. The only guidance they will give is that they try to have the results back within 5 business days. I also emailed the health department in SXM and asked them if our test results were not back in time, would testing at the airport upon arrival in SXM be an option. They replied within a few hours and were clear that we could not travel to the Island without a valid negative test.
Our plan is to travel on November 12th and West jet is still showing flights beginning November 5th. That could still change as September flight were cancelled, then October flights were cancelled. It's not looking good but we are still hopeful.