The USGS is excited to announce that Landsat 9 data is now available for download!
As of February 10, 2022, USGS Landsat 9 Collection 2 Level-1 and Level-2 data are available for download from EarthExplorer, Machine to Machine (M2M), and LandsatLook. Initially, only full-bundle downloads are available. Single band downloads, browse images, and Landsat 9 Collection 2 U.S. Analysis Ready Data will be available within a few days. Commercial cloud data distribution will take 1-3 days to reach full capacity.

USGS Technical Release: https://www.usgs.gov/news/technical-announcement/usgs-opens-door-landsat-9-data

USGS NLI Article: https://www.usgs.gov/programs/national-land-imaging-program/news/landsat-9-data-release-extends-unparalleled-earth