I usually just extract the raw Opus audio, then run it through Picard to tag and save it in my music directory. I don't see any point in converting to MP3 these days -- Opus provides better audio quality at the same bitrate (or, equivalently, lower file sizes for the same audio quality), and pretty much all player software supports it now. I've actually been going the other way and converting most of my music library to Opus and getting rid of MP3s.