According to the September 2021 report published by the DOT FMCSA Clearinghouse, there are almost 19,000 truck drivers eligible for hire. These drivers have completed the DOT required Return to Duty process to be able to return to the roads. Another almost 12,000 drivers are ready for an employer to hire them once they receive a negative Return to Duty test.
https://clearinghouse.fmcsa.dot.gov/Resource/Index/monthly-report-Sept2021