Strain dependent, but out of 16 square feet under 450w of DIY COBs, I expect between 600 and 900 grams dried per run.
The full tent picture was from last spring. I was one of the growers running the mephisto prerelease sativas. Those are them. Coulda filled the tent with one Hubbabubba Haze I think... at least 3x3. Hazes tend to not be real small plants.
The NCH I ran at the same time. She ended up close to covering around a 2x4 area. Training I don't do a lot more than some lst and undercarriage cleaning anymore.
Many breeders will give an expected yield per sq meter, and a plant count. And many strains can be small yielder... Girl Scout cookies didn't get its name cause it smells like thin mints... it's due to the average size of the nugs. A higher plant count is needed to make the same weight.
There are many variables at play, including your environment and grow level.
If your concerned about filling, start 1 or 2 additional, with the intent to cull or move outside if space gets tight.
New auto growers may have a round or two that are small compared to other grows seen, it's that first few weeks that make the difference. Smooth starts is the secret to large autos.