I've played Saxophone for years (classical) and have a full understanding of music theory. I've dabbled with piano a little, and learned a bach minuet and the first ~2 minutes of jesus joy of man's desire from nothing, but this is the only experience I have with piano.There are plenty of resources that teach beginners how to play piano, but how would you recommend someone with 7+ years of prior experience to learn?End goal is NOT to play pop songs, but rather some Chopin etc.
I would recommend a competent teacher who is flexible enough to allow you to learn classical repertoire at your own pace and interest, so not force you to go through years of method books. It is entirely possible to jump straight to real music, even if not Chopin. Since you already play an instrument, I'm sure you already know that you will have to prepare to do a lot of practice to reach that level.
Do not take online music classes. I repeat.