Kinda? "Saw them on the news" kinda, "met Superman once in vacation in Metropolis" kinda or "I'm actually a supervillain and have tried to kill them multiple times" kinda?
Sorry if I sound cranky, but I've found that time travel rarely ends well. Nor does so-called "higher" powers messing around with reality. Except when they're bringing dead mentors back from the dead, that I appreciated.