Those are looking gorgeous hanfhenf, you have done a wonderful job for your first grow my friend. :kusht: You must have dedicated yourself to learning.
I am with SG, if you have the ability to use a PK booster you will probably get some more weight out of those buds. The problem being, it is hard to tell where they are at as far as maturity goes. They quote a 67 day harvest.
Do you have a scope by any chance? I would be looking at trichs if so, if not, it is going to be a guessing game and you will just need to harvest by looks of the plant.