Yeah most guilds raid around 7-10pm est, your best bet would be to check the realm subforums and see if any of them raid that late
Illidan/zuljin/area52 for horde and stormrage/proudmoore for alliance would be good starting points
This one supposedly starts at 11:15pm so they exist, they’re just far and few and this late into the patch its possible the guilds are inactive until 9.1
Overall you’ll have a way easier time finding a raiding guild on horde. Way more options there