Looks very good - but as far as yield is concerned, there's no way for us to tell... there's no way for us to judge how dense the buds are - if they're light and airy, you might get a little over an ounce from the entire grow... if they're hard as a rock, you might get an ounce per plant... but you're much to early to even start to estimate this.... they've got a lot more bulking up to do, a lot more time under your lights and feeding themselves...
Good luck...