A bullpen session is a progress marker, not a return date. Leiter still has to get through the throwing program, respond well afterward and show that his stuff and workload are ready for game use. The Rangers' current update therefore points to movement in the recovery without promising an immediate activation.
That distinction matters for a club balancing rotation depth and late-season availability. Texas can use the weekend session to decide whether Leiter advances to another mound step or needs more controlled work before facing hitters.
The Rangers' transaction lane also shows no corresponding activation at the time of the update. For now, the reliable headline is that Leiter has resumed throwing and the next meaningful evidence will come from the bullpen session and the club's follow-up report.