Bill > SRes1

This resolution establishes a joint committee composed of two Senators who will work with a similar committee from the House of Representatives to formally notify the President of the United States that a quorum (the minimum number of members required to be present for an official legislative body to conduct business) has been assembled in both chambers of Congress. The purpose of this notification is a traditional procedural step that signals to the President that Congress is organized and prepared to receive any communications or messages he wishes to convey, such as the State of the Union address or other important announcements. This formal notification is a longstanding parliamentary practice that demonstrates the constitutional interaction between the legislative and executive branches of the U.S. government.

https://www.congress.gov/bill/119th-congress/senate-resolution/1/all-info