I checked the brix this Sunday the Foch ranged from 15.6 to 17.2. The average was 16.1. There are several green berries on each bunch. I would estimate that about 85% of the berries have completely changed. I also checked the TA and p.h. The TA was off scale (greater than 1.4) and the ph was running 2.6 - 2.8. So there is a lot of ripening to go.
We got about an inch of rain over the last week, so that may slow down the ripening a bit. If we get a dry warm stretch, they may be ready to harvest Labor Day weekend, but I am going to try to wait until the following weekend.