Leaching Questions Harvest soon...

I have been leaching with Clearex and ph'd water for 3 days changing res. every day. the last 2 days I have used ph'd water. Most of my leaves are still looking healthy and not turned yellow... (In 3 days will be the end of week 9flower)
My tri's are about 50-60% amber..

Does this mean all the nutrients are not flushed out? How do I know if it is flushed and ready to chop?

Clearex breaks the ionic bond of the nutes at the root zone. It isn't going to magicaly suck them from the plants tissues. Depending on the strain it may be days to weeks before strong yellowing is seen. It is going to be fine. Just slow dry and slow cure the buds to break down as much chlorophyll as posible.