If you told him that and mean it (I say this bc I said similar things to my now xAH and yet never followed through) then let your daughter know matter of factly of your plan and then do it when he drinks again (because sadly I think it is a given he will).
Your daughter will thank you for swiftly taking action and removing her from the environment. I regret terribly that I did not leave any of the many times I said I would and should have...