Hi Mia! Great question! I agree with the comments below. You can say 'when' (if you're joking around). It's most common to say things like:
⭐️That's great thanks
⭐️That's enough thanks
⭐️Great, thank you! (the person will understand you mean stop)
⭐️That's enough thank you
⭐️Fill her up to the top! (Don't stop until you have filled the glass completely 🥴️🥴️🤪🍷🍷