The only accurate estimate of how long a plant will actually take, is to talk to someone who has actually grown it.
The information that comes with the beans from 50% of seedbanks is BS. They tell you what you want to hear.
Those buds look like they could still easily double in size and thickness. But the strain might be a limiter too, maybe that strain doesn't plump up so much. That's another thing that only someone who has grown it could tell you for sure.
Long shot: I have had some plants that never got the thickness I was looking for, then I found I had the tiniest light leak, a pinhole really, but that affected the budding some and I got still-tasty but thinner nugs.
Might give it some more time, hate to get all this way and leave some weight on the table. Judge by the color of the trichomes. There's a mini microscope with a little light that they sell online for under ten bucks.
This is the bomb, get one of these and you'll see your trichs perfectly. When 10% are amber chop, no later unless you want sleep medicine.
Peace, Hyena