Looking at the CX website they only show showers at the Deck, and in February I am pretty sure I went there since the Wing was not open, and I always come out of connecting security closer to Gate 1 than Gate 60+. It looks like the old ground level lounge for J at the Wing is not even there (where the showers were).

My gates ex-HKG onwards tend towards the higher #'s so if the Pier has showers, I can kill time between arrival (0500) and lounge opening to walk to the Pier.

It's not clear if they have two shower setups or only one which makes no sense with only 8 shower cabins in the Deck.