You’re good. Probably thru at least early but probably mid/late September that far south. I’m around Augusta and never had an issue putting down around Labor Day. Probably won’t go that far this year just cutting back a tad on overall nitrogen usage this year

 

Not too late by a long shot. You have at a minimum 6-8 more weeks. Since you're using a fast-release, you may want to hit it again next month.

 

What specific fertilizer are you all plan on using with Fall ahead. This will be my first time fertilizing for the season.

 

Many (me included) spray Urea (46-0-0). You can usually find the Lesco brand at SiteOne at a good price. I spoon-feed (spray small amount weekly).