There is really no way to tell. So many things can affect your yield; genetics of parent, environment, your personal growing skill, a freak storm that blows a tree down across your powerlines and leaves you without power for 2 days...just so many things.
On top of that, we have no idea what strain you're growing, what your setup is like, or what the plant looks like. Without some of this information we can't even begin to poll historical data to try and guess your final weight.
Worst case scenario you get nothing, best case you can be looking at a few ounces (it is, after all, only 1 plant...although it could be a freak of nature and give you 10oz).
It can only be guessed at this point, sorry bro.