I am not experienced enough to say if they will be ready in 3 weeks but I do know you don't want to miss the THC window inless your growing for CBT ?sorry am not much use I hope it worked out for you happy growing
Looking good I use bioblizz all mix from seed no issues with nute burn I feed with grow bloom and top max can you not get a friend to keep a eye on your girl's while you are away ?
I am in the same boat as you ,I lost track of there age I am guessing they are well into flower but mine are both stunted have been from first week this is my first run I think I might get a few gram but I have learned a lesson your look a bit small but you will get some yeald next run you will...