Yes, today is Thanksgiving Monday in Canada. It is a federal statutory holiday. Government offices, banks, and most businesses are shut down for the holiday. That includes Toronto and Ottawa. Retailers are open on varying schedules, so check before heading out.
In the United States, today is Columbus Day, also a federal holiday. Some states recognize it as Indigenous Peoples Day. U.S. stock markets and many banks are running normal hours, but hours may be shorter than normal.