Yes, today is Thanksgiving Monday in Canada. It is a national public 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 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 open today, but hours may be shorter than normal.