How much longer til harvest you think?

I Started to flower this bad boy around the first week of April. This strain is White Russian by Serious Seeds.
I think the one in the back will be ready sooner then the ones closest. I think another 2 weeks for the plants in the back. I've been looking at the Trichs but they are transparent and milky not fully ready I imagine.

Also, does anyone know why my leaves look like that. I know yellowing is a natural process but the yellow and brownspots has led me to believe it is a cal mag defficiency, so I added a tsp of molasses.

What do you guys think?

3 or 4 more weeks, leaves look like some type of nute related issue ( burnt all the way up to the new growth as well as the lower suggests a mobile nutrient deficiency in its later stages) what has your feeding schedule been like and whats the medium being used?