The U.S. Dept. of Homeland Security, Office of Public Affairs, recently released this notice:

DHS Statement on the Lifting of Title 19 Requirements

Beginning May 12, 2023, DHS will no longer require non-U.S. travelers entering the United States via land ports of entry and ferry terminals to be fully vaccinated against COVID-19 and provide related proof of vaccination upon request. DHS intends to rescind these Title 19 travel restrictions in alignment with the end of the Public Health Emergency and the termination of the Presidential Proclamation on air travel.

For more information check the DHS website