It's about 1.3% of hourly waged workers who are at or below the minumum wage according to the BLS. That number is probably propped up though by the fact that only ~20 states have a minimum wage equal to the federal minimum and most of those are lower population states. After Texas the next largest state with a 7.25 minimum is Pennsylvania then Georgia.

https://www.bls.gov/opub/reports/minimum-wage/2022/home.htm#....

https://www.ncsl.org/labor-and-employment/state-minimum-wage...