depending on model, already have 320 miles https://en.wikipedia.org/wiki/Ford_F-150_Lightning.
They now test them doing things like going 70 mph without stopping, got 270 miles https://insideevs.com/reviews/598000/ford-f150-lightning-ran.... EPA doesn't drive them that steadily that fast on their test run. The new Tesla model 3 (highland) gets 370 miles on that test.