I would ask for the ones he's got done -- the best ones -- and then go and promote. Let him sit around on that last song as long as he wants -- your train has left the station and is already producing results with the songs he gave you. I always think about how I can get started "right now".
I've already made arrangements to get all of the tracks he has thus far this week. I'm going to try and exercise as much control over the situation as I can at this point.