Elon Musk tweeted yesterday that in about 6 weeks Tesla owners an over-the-air software update which will have an advanced summon feature. This update will apply to vehicle with the AutoPilot 2.0 and up hardware.
Tesla advanced Summon ready in ~6 weeks! Just an over-the-air software upgrade, so will work on all cars made in past 2 years (Autopilot hardware V2+).
— Elon Musk (@elonmusk) November 1, 2018