First class won't returned until 2023.
I have booked CX260 in November operated by 4 class 77W, it showed F0 A0 on expertflyer. Then when I checked again yesterday, CX took out first class inventory all together. I was able to reserve 1A by calling CX, should be an amazing flight haha.
I think they are in the process of redesigning FCL service and training FAs since they haven't offered FCL since 2020, it could take a while.