Electric tractors aren't a thing. That is because a battery big enough to power a tractor pulling a plough all day is infeasibly large. Pulling a constant load is a very different thing to a car that coasts most of the time.

Humans are not strong enough to pull ploughs. You could grow food and feed it to draught animals, but as you point out, that is horribly inefficient.

Mythical Electric Tractor or not, you still have carbon being released from the ground by ploughing to control weeds. You can avoid ploughing to control weeds with glyphosate.

When a better solution for weed control comes along we can say goodbye to glyphosate too, I believe it is about as far off as Desktop Linux, as in 'next year'.

Just remember, glyphosate costs farmers money. They wouldn't use it if there was a better way