fungal desease? and ready to flower?

It's not WPM, I'm not sure of the name of it but it needs to get cut out. You would be ready to flip but I wouldn't until you have kept a close eye on the others, if it's spread to the other plants then your chances of having a harvest without moldy buds is slim. I'd remove the plant or cut away the cola that's effected. Check others daily for a week or 2 and if there is no more then flip. This is just my opinion and may not be the best advice. Search the Internet to find what it actually is.

Coinsido con organoman. Es botrytis. Elimine por completo el hongo de sus plantas antes de voltear. Ya que el lugar preferido de este hongo son los cogollos densos. Controle su humedad y temperatura. Veo en su diario que tiene un pequeño ventilador para la circulación del aire y la temperatura de su indoor no son muy altas. Pienso que el problema está en la humedad.

Not powdery mildew, but botrytis. Powdery mildew starts on the leaves and is white, not black/grey. Certainly do not flip until the disease is eliminated otherwise it could get into the buds and destroy your entire crop.

I think it’s powdery mildew. I got this on an outdoor plant before and it was because it was too humid and like no airflow for an extended period of time. I strongly advise to get this taken care of before you think about flowering because this can happen in buds FAR EASIER than a plant in veg. Check your humidity levels and temps. Increase airflow and ventilation out of the tent and if you are spraying your plants, stop immediately Remember mold grows in wet and stagnate clients. I hope this helps.

Looks like powdery mildew to me. been there a good long while and been spreading at this point. amputate around it... generously. cover it while you do it so the agitation doesn't put off more spores than necessary. despiet what you will read out there.. there is no cure.. home-remedy bullshit like the "cornell formula", which has nothing to do with the institution whatsoever, does not work. Nothing will kill it. Even professional-grade fungicides commercial farms have access to have an effectiveness rate of 33% reduction compared to a control group. wpm is 100% about prevention. Are you hitting dew pointn after lights go off? this would be something to look into... temps/rh in good range? if you get condensation on plants or regular spray it with water, you are asking for trouble even if trouble doesn't find you each time you do it.