To the degree that anyone other than Harmy can be trusted to speak on this matter…
Harmy’s definitely done preliminary work on 3.0 for the other two films. That’s not anything near equivalent to saying substantial work is completed on either of the other two, or that they’re on some sort of parallel track, or anything like that. Some of that work was done in 1080p, before he’d decided to switch to 4K for the 3.0 series, so some of that work would need to be redone, probably from scratch. IMO Jedi 3.0 was prioritized simply because it was already closest to the finish line – the cost/benefit ratio simply favored that one. I suspect the same logic will be used to determine the next candidate film*
Historically, Despecialized has been a “release when it’s done” project, not a “release early and often” project. Not that there isn’t a cottage industry around guessing release dates, and even Harmy joins in the guessing from time to time. But the guesses, broadly speaking, are almost always not only wrong, but so badly wrong as to be totally misleading, and considerably less helpful than simply admitting nobody knows. Like, predicted release dates being off by a year, or more. So veterans often hesitate to repeat their mistakes by guessing new release dates. Also, I think it’s widely understood that Harmy has a lot less free time than he once did, which necessarily drags out his timelines more than ever.
* My money’s on Empire, but re-read what I just wrote about predictions