how much more will my buds swell

im at 4.5 weeks flowering just wandering how much more my buds will swell my plant is more indica closely related to northern lights heres a pic

I can't make out enough detail in that picture. From the amount of orange that seems to be there, I'd say it's time to look at the trichs under a lens. OTH 4.5 weeks out of 8? 9? weeks, she should put on a lot more weight in that time.

There's two kinds of 'swelling' that happen. The cola's swell due to new bud formation. When the buds are close to harvest time, the buds themselves swell up as if they were holding a seed and you can see a mass of little round 'fruits' under the pistils.