How many plants are you growing? It looks like just one?
There has been a lot of speculation on the genetics of this strain. Having parents Black Widow and Haze C would fit Shanti's description:
"Grail Widow will be Sativa dominant and subject to stretch in the first 2 weeks possibly 3 weeks. This plant can be topped up to 4 weeks into flowering...I believe it will be 12 weeks flowering in general a few more a few less. The thing to concentrate on here will be resin production and aromas."