Without knowing what the genetics are of the bagseed you have growing, it's difficult to guess the final yield. Also, you haven't included the size of your pots. Having large pots will help yield considerably since larger roots - with more room to expand - equals larger flowers.
My advice would be to take some cuttings now of the plants you have before they get too deep into the flowering cycle. Hopefully you have somewhere you can let them veg in 18/6 light/dark cycle. If the bagseed turns out to be good then you can run the cuttings again making adjustments on what you learnt about the plants the first time round.
Less is always more when trying out new varieties or bagseed. Try not to overfeed, it'll give you a better idea of what you have. You can always improve on the next cycle/grow.