I do a similar thing when I walk my dog. I have this primitive audio recorder app on my Android phone - the only requirement I had years ago when I found it was to be able to record directly into mp3 files, but that is no longer relevant. Anyway, I would just walk and talk into my phone. It records. I have collected numerous such recordings over the years, but they were pretty much useless. Until relatively recently. These days I have Resilio (for a stupid reason, not Syncthing, which is also a viable and perhaps better alternative) to sync my audio notes, and then I have a script with whisper.cpp hooked up. The script simply turns that into text - technically, it creates a subs file. Why subs file? With the .srt file I can not only grep through those notes, I can play them karaoke style in my editor - Emacs has subed mode that allows you do that. I can also easily hide timestamps and other metadata to focus purely on the text. I can correct wrong text recognitions, add my own comments, etc.