I agree, another 4 weeks or so.
Wait until the pistils are 95-99% brown, this will give you well matured flowers with peak THC and terpene levels.
Leaving plants until they are over ripe with all brown pistils will give you flowers with reduced THC and elevate CBD and CBN content, producing a sleepy heavy body stone effect with a reduced "high", due to the almost stopped metabolism of the plant being unable to replenish the THC faster than the THC is breaking down into CBD and CBN, two non-psychoactive cannabinoids.
Hope this helps,........
Organoman.