Battery pack density would need to be about 1500wh/kg in order to start being a serious contender on very short routes (sub 30 min). Current packs are about 250wh/kg, with Amprius claiming 450 wh/kg cells (not packs).
So most likely 20+ years to go, and much longer for long haul. Hopefully SAF or hydrogen solves those problems in the mean time.