its not sensible to say 2 or 3 ounces because we don't know the specifications of your grow. Veg is misleading it is easier to grow a vegged bush and harder to grow big dense buds out of that bush. It can grow beautiful then flower fluffy and unfulfilled. To make a good estimate people need to know the light source and intensity nutrients used etc..
A led grow will yield differently than an hps than cfl and so on. watts used, lumens available light spectrum. All need for good estimate.