The last issue of The Saguache Crescent appears to have been in March 2023, so there may in fact be no Linotype machines still in operation in the USA.
For context, Linotype alloy is still listed/sold:
https://www.rotometals.com/linotype-alloy-5-pounds-4-tin-12-...
and there was a recent Kickstarter in Europe to preserve one for usage:
https://www.kickstarter.com/projects/1755997589/the-magic-of...
and I'm pretty sure that R.I.T. still has one in operation (a student when my daughter was there did a card which was typeset in Trajanus, which was a Linotype font).