You need to find out what type of distribution system your neighborhood has regarding upgrades.
I would think most are on a 12 or 13kV system. It’ll take a good amount of usage to suck that all up even if everyone has EVs in their garages.
If you’re trying to head off problems you need to consider that the grid will go down - permanently. Yes those are the plans and the only installations that will have power are military bases, hospitals, and “rich” communities that lick the hands that feed them.
There’s a dude I know who has gone off the grid 100% with his home with solar panels and his generator. He drives an EV. I’m betting he’ll survive a few weeks max in a SHTF situation.
The most common primary distribution voltage in use in the USA is 7200V phase-to-neutral.