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 hit or miss today, so call ahead before you go out.
In the United States, today is Columbus Day, also a federal holiday. Some states observe it under a different name. U.S. stock markets and many banks are running normal hours, but hours may be shorter than normal.