Some are a bit closer to harvest and should be ready in a week or two and some look like at least another two to three weeks before they are ready. I would advise to remove, or at the very, not use the thing that looks like a humidifier. Excess humidity is not really required by cannabis plants, and excess humidity at this stage of flowering will potentially cause mould and/or fungal problems with your wonderful flowers. When you think of where the many types of indica plants originated from, such Pakistan and Afghanistan, people certainly do not immediately associate those countries with high humidity. In fact you would be bonkers for suggesting those countries as having humid climates. Your flowers at this stage of maturity can not be forced to "get fatter" with any sort of artificial treatment. Flower size is controlled by genetics and all growers can do is to provide the optimal conditions for their plants to thrive and produce the best flowers they are genetically programmed to do.
Hope this helps,..... Organoman.