Lets see if anyone can post their experience.
I understand only “Non-essential travel” is not permitted, which includes travel that is considered tourism or recreational in nature.
Under CBP border travel restrictions, only essential travel is permitted across the U.S.-Mexico and U.S.-Canada borders, which includes travel by U.S. citizens, lawful permanent residents, foreign nationals traveling to work in the United States, and those using the Visa Waiver Program (VWP) for business travel.
I understand TN status can travel, under the "foreign nationals traveling to work in the US" are allowed.