As of now, NCIS Season 21 is still in progress, and there is no indication that the series is being canceled. Despite not being the network’s top performer, NCIS remains strong in live ratings and is popular in syndication. Its success in the Monday 9 p.m. ET/PT timeslot, competing with Monday Night Football, has proven beneficial for CBS. Given its significance as the flagship series for potential spin-offs, it is unlikely that CBS would cancel NCIS, especially with other shows on the network performing worse. The ongoing strike primarily affects scripted shows, and NCIS Season 21 is currently unaffected.