I think you'll see the seed sprouting in the next few days. I live in Cape Charles, VA and seeded some bare spots in my lawn about the same time you overseeded. I spread straw over the spots and have watered every day, at least a little, despite pretty steady rain and cool weather since last Thursday (50s and rain). I can just see a few sprouts coming up thru the straw.
The warmer weather the next few days should help and I think you'll start to see results.
If we get our usual Indian Summer your grass should have a good start on next year.