Canada Post has reinstated its on-time delivery guarantee for international mail from the United States, according to the US Postal Service. The previously declared force majeure for all international letter-post, parcel-post and EMS items has ended, it said.
We could not find a notice of the change on the Canada Post website, but you can find a page about COVID-19 updates on this page.
Note that Canada Post resumed On-time Delivery Guarantees for domestic packages on August 23, 2021.
The USPS updates a list of international mail service disruptions on the USPS website.