Please help a rookie..leaves yellow and spotted...close to harvesting time (I think)

So I have done some research and believe I have had a nutrient problem, but because I was already so far in the flowering stage I figured there wasn't a lot I could do (although I havn't added anything for the past few weeks at all when watering). Previously the yellow and spotted leaves were actually not near any of the buds, but now it is much worse and close to the buds (please see attached). So are they close enough I should just harvest now? This is my first time, and I would hate for this to somehow be a complete loss. Since the problem seems to be getting worse, I am not sure what to do. Not sure if it matters but these are white widow.

Just adding one more pic, as close as I could get

deff looks like a cal mag problem almost look like the problem i had twards the end with my blue cheese good luck

It really looks like it needs more time how far are you into the flowering phase it deffinatly is a nutrient problem that could have been fixed pretty easily with a feeding of nutrients sometime ago but now to me it looks like your plant is going downhill fast as i am not a proffesional i cant tell you to chop it down cause i dont know if feeding it would save it cause ive never let a plant get to that point im still fairly new ive done probably over 200 hours of study and research but it doesnt mean shit till i get some more grows under my cap so i wud wait for a better answer from one of these pros it will come maybe it can be saved but i doubt it

Yea ^ what he said, a lot of those leaves don't look like they are coming back to life, the plant being this far into flower will not regrow fan leaves. It is definitely a nutrient deficiency. Your buds are looking very nice might I add, lots of trichomes. The earliest I will harvest is when about half of the hairs on the bud have turned red or amber. I see quite a few red hairs on your plant, how many weeks have you been flowering for? Maybe its best to start flushing soon, so if you have to end up harvesting you'll have some clean bud.

I switched to 12/12 about 6-7 weeks ago. Ive been flushing for almost 2 weeks now mainly because I thought it would help with the leaf issue too.