It’s unclear to me what his plans are for the rest of the trilogy. He mentioned a few lines of Empire, so that’s probably on his radar, but I don’t know his timeframe for a completed translation (Star Wars took a long time, I’d imagine ESB would as well). I don’t know if he has any plans for ROTJ at all. If you’re interested in improving the Finnish subtitles overall, you might be able to coordinate with him either via PM or in this thread–something like you take ROTJ, he takes ESB, and you collaborate on consistent translations when you opt for different words, that sort of thing. All I can do is cheer you on.