To me, these flowers look ready to harvest right now, as this is my preferred level of maturity/ripeness and will produce a more clear and positive high. Leaving the plant for another 5-7 days will result in a heavy, sleepy and lethargic type of stone. It is up to you and your preferred effect, but any much longer and you will end up with a rather degraded THC quality due to your plants metabolism having nearly stopped by now, causing the THC to break down into CBD and CBN, which produce the heavy drowsy effect. Either way, harvest in the morning time, putting them in darkness for more than a night will just slow her metabolism even further, resulting in even more THC breaking down. For an insight as to what "bananas"/ male flowers look like, go to my diary "cannabis conundrums" and here you will see pictures of male flowers, bananas/male stamens, as well as other weird and wonderful pictures of some of the things cannabis plants are capable of doing.
Hope this helps,.....
Organoman.