If you want one clear sign that the future you imagined is here then stop looking for teleportation or nuclear fusion because all you needed to see was Tony Hawk replacing his skateboard for a hoverboard.
That very thing has now happened, which by default must mean that the future you imagined as a child has finally arrived.
Hawk was testing out the Hendo Hoverboard, an electromagnetically powered board that can float above the ground thanks to powerful electromagnets.
In much the same may that a mag lev train is lifted off the ground, so too does the Hendo lift both itself and the rider above the ground, reacting to the metal plating that's used as flooring.