End Nutes Added!

Just went to find something to help fatten the buds and got Kushie Kush and they gave me free Grape Sweet. What do you guys think these might do for the end, maybe last 3 to 4 weeks, flowers??

My plants are in late flower with the green leaves all seemingly fine? I have not given them any N for a long long time 2 plus months so is this normal and or when should I expect to see the N deficiency or will I ever? trying to not harvest to early and with the trouble seeing every single clear, cloudy tricome it is not so easy to tell with three strains, when they are really done putting on weight which i understand is a lot in the final couple weeks so don't want to like take em 3 to 4 weeks to early...
Thanks every so much....

Kushie Kush has really helped my Purple Kush. I got it in week 3 and ive been using it til now (start of week 7 today) and they look amazing!