What ADS-B weather will I get near the USA and Canada border region?

The Stratus does not provide ADS-B information for Canadian territory.  The ADS-B information provided is only USA information.  

There are no Canadian METARs, TAFs or other products for Canadian airports broadcast over the ADS-B system.

XM is a source of weather information for Canadian pilots. It has a monthly fee but the coverage is excellent.