Organic soil or hydro? What container size? 9 to 12 inches multi-topped bush or regular tree?
If soil... I would get them into 5 gallon pots. If multi-topped, 12 to 14 inches is fine... and the final plant height should be between 20-24 inches (due to multi tops) and yield will be around 8 to 10 ounces. If in 3 gallon pots... 6-8 ounces...
If naturally grown, in 5 gallon pots, yield will be between 5-9 ounces... with 3 gallon pots... 4-8.
If you have more height... for example final plant height 4 to 5 feet... multi top them... in 5 gallon pots, and yield about an ounce each.
A superb yield would be considered 1 gram per watt... 400/28 = 14.28 oz.
A low yield would be 4-6 ounces, a decent yield would be 6-8, and a great yield would be 8-12.
Give me more info about your height availabilities, and how long you have to veg, container size, nutrients, etc... mh to hps, hps only, mh only... veg lighting schedule 18/6?
Very very many variables to determine the answer.