Dear unsure, I remember another member, in a similar situation, filed immediately---based on the idea that you can file, but don't really have to go forward with the divorce unless you want to. (She wanted to show him her teeth--that she was dead serious).
I get the impression that you may want to divorce even if he does become sober? I'm just asking (I know that feelings can change). Also, are you aware of the difference between being "dry" sober and true recovering sober. Not knowing the difference has tripped up many a hopeful spouse.
I want to add that I admire your courage in taking action to change your situation. As they say--nothing changes until something changes.
Alanon is there to support you and your children through the long haul.
dandylion