yeah you can harvest it in that small container but why not transplant?? you would have more dense buds and more yeild...
i have a grow going now and transplanted from 3 to 5 gallon bags and trust me the buds need the extra grow room!
Just a few things you might need to know, for example with less medium you have to water more also the plant might not grow anymore. So if you dont have the space for the thing to grow on then leave it in the current pot.
Well thats all ive got
take care of your hunny there!