You're still early, but if i have to guess, assuming all goes well..with a 135 watt blurple led, im guessing maybe 3 oz's..maybe less. August 27?! That's a long time to grow 1 plant!
If you grew it for this long, and have only 1 for the flowering tent, you should have scrogged it, or at least train it heavily to take advantage of all the lower growth budding sites...like this you grew a big plant, but the bottom half won't see any light and the top part that does is only getting a weaker blurple led. With weaker lighting, and especially when you grow a plant for so long, you want to take advantage of all the flowers so the extra growing time benefits you.