I'm on Eastern Time (same as New York)
I usually post at 3AM because that's when the new day starts for us on imgflip in that zone. Still, I haven't found an ideal time for people to see my posts. I've seen submissions that were featured within an hour, and I've seen submissions not post until the next day in the evening. Usually, they'll feature all three of my posts quickly, other times, they'll spread them out. Mostly, I guess, because I use custom templates.
If you can figure how to get them featured around 6 PM, they seem to do better.