When does the server know when a client has finished server travel (not seamless)? There must be a callback somewhere but I can't find it

[rantrod]

It seems like GameMode::PostLogin is called before the level is done loading. I tried doing a line trace on PostLogin on a loop until I got a hit once the level loaded and it took a bit of time. Rather than writing a loop, anyone know when I can be sure the level got done loading on the server side?