Federal death penalty cases are...well, not really followed through on.
There have only been 16 federal inmates put to death since 1976, while Texas has executed 591 since 1982.
(Death penalty was re-instituted across the US in 1976)
Just add this tidbit from Google.
"Texas has executed more people than any other state, and more than a third of the national total. However, the pace of executions has slowed in recent years. As of December 12, 2023, Texas has the smallest death row population since 1985"