The same place as all the battery semis: they don't exist yet. That is the whole point of this research thing that actual truck companies are doing.

Hydrogen is more feasible than battery for long haul as the technology stands now. A lot of big names in commercial trucking have made huge investments in it.

But it's still not there yet and likely requires some giant gov't subsidies or some tech breakthrough. No amount of $ makes batteries work for long haul at current tech or anything we see in the near future.