To be honest the strain guide is only a guide really, plants are done when they're done unless you're one of these cash crop chinks that think they've really got a 6 week strain.
If you look at the structure of the bud it's just started to throw out another growth spurt indicated inp the areas marked....
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.......those new calyx clusters will swell for a few days then the hairs will start to turn brown like the others while another growth spurt throws some more clusters out and fills the gaps in between the these ones.
If you look at a bud that is about a week or 2 from being proper done you'll notice the bud is made up of one big solid mass of calyx clusters with no more space left to fill.....
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......and all the pistils have died back.
That's what you're aiming for, big solid buds with no space left for growth.
But aye it's a grand job for your first go.......