Not sure what a weight pistol is...
Typically it will take 2 weeks from the flip to 12/12 to see the hairs (pistols). I can see one or two in your pics.
It will then take 8-12 weeks (plan on 10) from the flip, depending on the strain, to finish. During this time, the flowers will put on considerable weight.
You may want to make sure your LED light is 18 inches or more away from the plants as they stretch. Strong LEDs may need to be further away.
PS I had a buddy grow some shiskaberry about 15 years ago - it was some of the best smelling bud we ever had. It literally smelled like candy and you would want to eat it. Hope yours turns out just as nice!