To me, yield doesnt matter as long as the smoke is good. But yeah anything over an ounce per plant is good - outdoors, you can get anywhere from 4 to 16 ounces.
Its a good idea to grow a few more than you need thinking about it. One - you get more females (hopefully). Two, you can harvest one early because every grower goes through that stage when its halfway done where they think about chopping it. I know I have