Don't chop yet. Those yellow leaves are storage tanks for your plant. You've cause a nute lockout in the root zone and now the plant is pulling what it needs from the leaves. It does reduce your final harvest weight but you will still end up with less of lower quality than you would if you waited another few weeks. The buds will still mature and pack on more weight if you wait.
Looks like you are in Coco, if you are push about 50 litres of ph'd plain water through each pot and then feed the recommended mix for your nute line but cut strength by 50%. After the flush you want your EC at about 0.8 or 400 ppm. Do that for one week then slowly work your way back up to about 1.2-1.4 EC.
That's only for coco, if you are in soil then you will need advice from a soil grower.
Best of luck