September/October for DHS seems a bit ambitious and considering Disney said it would open in fiscal 2020 I don't really buy it.
Opening Date for Star Wars: Galaxy’s Edge To Be Announced Thursday, Florida Date Moves Up
I agree this is unlikely and early November seems more likely. But for me personally the earlier the better. We're going over Christmas and New Years no matter what and it will be much easier to plan the trip the more we know about SWGE and how things are operating.