Travel to Canada will my US apple TV work

Maybe. Maybe not.

From the USA Apple Media Services Terms and Conditions document but I suspect they are very similar for all versions of this document --> hhhttps://www.apple.com/legal/internet-services/itunes/us/terms.html

"Certain Services and Content available to you in your Home Country may not be available to you when traveling outside of your Home Country."

• iTunes Store purchases (movies) would likely continue to work, according to user reports.
• Not sure about Apple TV+, although I would expect it to work. Please let us know.
• National TV Network apps and subscription services will likely not work, as those will use the geolocation of the IP address, and notice that it is a different country, for which their content isn’t licensed.
• Netflix will work worldwide, although available content may differ.
• Amazon Prime Video works in all their own supported countries.