How should I approach my ex about getting my half of our security deposit back?

Hello! My ex girlfriend and I were living in an apartment together until recently, and we originally went in half on the security deposit. I've recently decided to remove my name from the lease and live elsewhere, while she takes over the remainder of our original lease herself and stays. Since I won't be around when they return the deposit at move-out, how should I go about getting my share back?

Is it fair to ask for it now while the situation is still fresh and since I'm actually in my own move-out period, or wait until she also moves out when the lease term is up (can't be certain if she would move out or decide to stay longer), when the money would actually be in hand first, and after verifying that our property manager actually returns it to us first? My concern with that option is a) obviously that I'm on my ex's time receiving the money and b) there's no guarantee she would actually return it to me, either by disregarding the issue after so long, forgetting about it, lying about getting the deposity back from the property manger, etc.

Surely this isn't a super uncommon situation, so what do you all think? Thanks in advance!