It will be interesting to see what happens with the incoming administration, although it is the Senate that would have to approve. That might be difficult. It's important, though.
I think we should bear in mind that on at least three occasions, Congress, on a bipartisan basis, voted to stop American arms exports to Saudi Arabia. It was only President Trump's veto that stopped that. The United States, with respect to Congress, wanted to stop arms exports to Saudi Arabia.
There may not be a likelihood of the United States ratifying the treaty. It's unlikely to get through the Senate. However, that doesn't mean there isn't a lot of pressure in Congress to act in accordance with the international legal obligations.