Honestly, I don't do preloads. It takes less time to D/L the game when it's fully unlocked than it does to preload and then have to wait for Steam to unlock and verify the files (downloading any additional items that weren't included in the preload even on my Samsung 950 Pro NVMe). I'll just wait till tomorrow and have the game up and running faster than those who preloaded.
Good for you. Not everyone has gigabit.