2 x Red Gorilla Girl XL Auto + 1 Tropicana Poison XL Auto

No, you don't have to do it all at once.. but i would be a bit concerned if there is a very long delay from first to last --- dead rotting roots? how long before they die? as long as that isn't an issue, shouldn't be a problem. It will remain alive awhile after it has been chopped down, so there's definitely some leeway there. Think the middle pic is showing a new wave of pistils vs original growth? if trichomes look good on the non-new calyxes, it might be ready soon. the others look like they have a while left.. the calyxes are not plump around the pistil - giving the illusion they have shortened, but really it's the plumping around it that is the cause. they do die and coil up of course... a good chunk of them should be by the end.

If you've no ventilation. Your heat Vs the cold when lights are out causes stretching in pre flower Keeping the temp within 5-6c is crucial for non stretching durin pre flower.. You could HST on the last few days of pre flower coming in to fattening. Tieing down the nodes (supercropping)

I typically only do this for plants that are too close to the lights compared to others, and therefore the ripeness occurs a bit faster at the top than normal. i've tried it in other contexts and i didn't see any meaningful benefit for 3-5 more days for the lowers... the good buds were still where they were expected and the larf was normal relative to how well i trimmed off lower sites early in flower. if i left too much at bottm, that shit is never going to look good, lol, so don't try. focus on the good stuff. you don't really gain any weight for doing it - a limit to how much can happen in a few days. The only reason would be for concerns related to trichome coloration and your feelings on what is best. when i have a tall plant that gets close to lights and the top 3-4 big colas at top start turning purple from the lights.. that's when i do it. So that stuff at top isn't 100% amber if i wait for the bulk of trichomes on good nugs lower on the plant to turn the color i want. Typpically levels it out with any other plants..

get some extra fans in there if you can and if its only got a few days left then consider opening the tent up during the dark period