It’s almost done, I promise you; I’d say it’s at least 80% done. Next one after that will be released on the 24th if things go as planned; if that doesn’t work out then I’ll try to schedule my posts so that I publish one on the post series’ birthday regardless.
As for my next Problem Sleuth post, I haven’t been working on it very much, though I probably could finish it in the next few days while I work on my next Homestuck post after the one I’m working on, though not before I finish the one I’m currently working on.