will my buds increase in size much in the final 3 weeks of flower?

i have 3 killa watt ladies just starting week 7 of flowering, i am using a 600w hps with cool tube my buds look ok but as this is my 1st grow i was curious to know how much they should increase from wk7 to wk9?

im noe expert but depending on the strain, they will have a last burst, i stop nutes and use only ph'd water and mollasess in week 7. they still seem to get bigger, maybe 10 or 15%... happy harvesting dude..