He's outside of time and space. Ain't no "before" there.
But what does that mean?
Would God experience time in any sense? Would he experience a "before" and an "after"? Would God ever change his mind, or work his way to a conclusion? If there's no concept of time to God, then I don't think we would be any more comprehensible to him than he would be to us.
You don't know that.