My last grow was AK48, from you pics I say you have at least 3+ weeks left. Mine flowered for 70 days, I did a complete grow journal on the AK48 if you wuld like to check it out.
Nice looking plants, but you might want to try topping your next grow for 4 main colas....keeps the canopy level and increase your yeilds
Nice job: Stlmatt