We follow the guidelines that the Public Health Agency of Canada gives us. That hasn't been deemed necessary at this time. Transport Canada advised the airlines that they must make sure pilots and cabin crew notify us if someone appears to experience symptoms during the flight. That way, the individual can be screened first, so they aren't waiting with all the other passengers. If no one shows any symptoms, passengers go through the normal process. We ask them questions and determine where they should go next depending upon the answers they give.
On February 3rd, 2020. See this statement in context.