Smashed beat me to it.
he's right on the money.
If you haven't started flushing, start now.
plain water every couple of days until they're ready to chop - which from the pics looks like maybe a week to 10 days.
But definitely start the flush.
The plants will start to look like they are dying (because they are) and may even turn kinda ugly looking - that's all normal & to be expected.
Just keep flushing, no more nutes, except maybe a touch of molasses at the very start of the flush.
Are they in soil?