The following is the April 25, 2022 Government Accountability Office report, F-35 Joint Strike Fighter: Cost Growth and Schedule Delays Continue.
What GAO Found
The Department of Defense (DOD) has not yet authorized the F-35 program to
begin full-rate production. Full-rate production generally is the point when a
program has demonstrated an acceptable level of performance and reliability;
and in the case of the F-35, is ready for higher manufacturing rates. The delay in
reaching this milestone...
https://news.usni.org/2022/04/26/gao-report-on-f-35-cost-growth-schedule-delays