I’ve only had 1 harvest, but So is pretty late for an “Early”. The first one was ripe (about half brown, 20-25 brix) on 9/11/15, with more continuing to ripen through the last week of September. I picked a few during the first week of October which were all brown (~30 brix).
It wouldn’t surprise me if I see a similar time-frame this year. I just noticed the first fruit-set a couple days ago. I wonder if pollination issues can lead to a later harvest season (by the time it pollinates it is late into the summer…).