The plants are near the end of their life cycle. You are 3 days from harvest. They aren't going to look pretty, they are decaying and dying, thats normal. Your buds overall look small in the pix. There's no bud rot that i can visibly see. Besides. If there is any rot it's not easily seen usually because the rot start within the bud by the stem. I've never seen rot begin on the out side of the bud. They are fine as far as i can tell.
Buddy below see's a huge calcium deficiency. I think he has some brown shit on his glasses lol
Anyway, chop, dry, cure, enjoy. Congrats on making it through to harvest!