That will depend on your experience and how many in front of you become eligible and able for command. There are a lot of inexperienced SO’s on the list so it’s hard to say anything sensible here.
The A321 flies returns and integrated patterns with overnights. Currently the consensus seems to be that the A330 has the worst roster and pay. Higher overtime threshold but short haul operations with minimum days off. Hirings will eventually alleviate that.
If you like staying on the same body clock flying the neo will be nice. It’s essentially the Dragonair narrow-body operation transposed onto Cathay Pacific. Flying hours wise I think it’s reasonable to assume 50 hours and 600 per year.