If you still have 1-2 weeks left you can still feed 1 last time. if you begin flushing now so many leaves will yellow and begin dying that you will have a much greater chance of getting bud mold. Bud mold often starts where fan leaves connect to the stalk deep within the bud.

The best flushing results I have ever gotten for taste and quality were by doing two flushes back to back.
I flush with twice as much water as the container capacity. (5gal bucket would get 10gal of water. 10gal bucket gets 20gal water and so on.)

First flush is about 10 days from harvest.
Let the soil dry completely.
Second flush, same thing more water if you want. just make sure on the last flush you run water through the plant until the run-off is clear.
Let the soil completely dry out and then harvest.

Just make sure to pick those yellow leaves to help prevent mold.

Plants look fine though good job!