AFAIK the remaining sugar leaves will still photosynthesize, which is why some people will heavily defoliate in late flowering, but from the looks of your plants it would seem like they are in the process of dying. They were probably severely underwatered for a ~45% RH and ~29 ºC temperature, which is evident to me as your substrate is seems really dry all around except for that little bit of water around the main stem. You could try watering them thoroughly and giving it a few more days, but if they (the healthier looking ones) don't bounce back, you should probably harvest.
Next time, add more perlite to your mix and don't be afraid to saturate it when watering/feeding. With enough perlite, it's practically impossible to "overwater" (i.e. to asphyxiate your roots), specially in a fabric pot, as there's always enough oxygen in the root zone.