One theory of time is that everything has happened at once - no time travel needed - we only perceive it as moving in a certain direction, but that direction could go from the future to the past as easily as from the past to the future - there is simply no way for us humans to tell.
Yup—that is related to the McKenna view—once we “invented” time travel it may just mean being able to perceive that (ridiculously confusing and chaotic) reality.