Depends on how patient you are. IF Bruce starts in CF, I think he is easily capable of putting up 10th round numbers, and I'd grab him in that round. BUT, his manager is Dusty Baker. If you are young and talented, there are no words more distressing than "Dusty Baker is your manager." Dusty Baker wouldn't have given Babe Ruth a chance to start. Even now, he is talking about signing Lofton to start in CF, and sticking Bruce in the minors. If that happens, the question is how important production is for you this year. If you are trying to build a strong team for the future and are willing to get limited output for this year, grab Bruce before round 15 and wait.
Bruce is currently not being selected until late--rounds 18+. So, you can wait pretty long, even in a keeper, I think, if Baker keeps talking like this.
"I don't want to play golf. When I hit a ball, I want someone else to chase it."