3-4 weeks easy . Pistils are still white , not receding either. Good looking sugar but buds will fatten up in next couple weeks . Breeding estimates are only guides to ACTUAL time to harvest. Most of my autos go from Day 73 up to 84. Depends on pheno of plant , sativas like longer flowering.
The Breeder packs show such short times BASED ON OPTIMAL GROWING CONDITIONS ( i.e Lab Grow or Controlled Breeder grows to study the genetics ).
Autos can benefit from longer grow times. They mostly can finish with 90 days , but there are SUPERAUTOS with size and other genetic differences bred into it.
They look like some good flowers and i would wait for proper ripeness.
As it ages , it will start to show yellow leaves and drop off ( its NOT a deficiency , its the sign showing the end of its life. ) Pistils will turn and recede , calyxes will swell .