if you are enjoying your degree, complete it. these are very important years where you will gain a lot of character development, maturity and independence. best to get your parent's full support so talk with them and make a plan together. you may even wish to contact the recruitment staff at the cpp to get some advice. you can apply after you finish, and an aviation is sometimes the deal-sealer in showing cathay your commitment to becoming a commercial airline pilot. good luck with it.
I applied to cathay halfway through my degree, but it turns out I am now going to complete my degree before doing my flight training.