Time travel is very much possible if there is parallel reality. Most scientists have agreed on the possibility of the existence of parallel universe. Knowing things way before it happens is also a sort of time travel effect, your subconscious dwell in parallel universe at least to say for some people who precisely averted next day dire consequences following their last night's dream , a state when your inner conscious wakes up and your physicality turns off. For many it's nothing but mere daily routine of going to bed and waking up, for some it's dwelling in parallel timeline and seeing things way before it's happening. This is sort of travel travel effect for me.

Now, physically going through the rip/vortex in the fabric of space and time.. and entering to different point of this linear time, that's something I'm personally dreaming to get materialized, and scientists are giving 'GREEN UPs' for its possibility.