Google Messages is now the stock texting app on the Galaxy S22 Ultra in the US
Customers in the market for a new Galaxy S22-series phone in the United States might be assured of a fully-featured and up-to-date messaging experience out of the box. The OEM has pre-installed Google's messaging app and set it to accept and show messages rather than its own stock app that does the same. This allows the phones to use RCS by default.
Source: notebookcheck.net