I think Goga comes over right away ... and I don't think he would even need to travel to Austin. He's ready to play.
But as someone pointed out in another thread, with the Celtics apparently losing Horford, they suddenly could be in the market for a player like Goga at 14.
I haven't finished going over his tape but I'm not sold he's worth paying the money to bring him over. He's a Rock 'Em Sock 'Em Robot style center and you can get passable guys like him for around minimum contracts. Five years ago, he'd be worth the money. Today? Eh, he makes Poeltl look like Magic Johnson in terms of perimeter talent.