As someone that is look for jobs right now and talking with a lot of tech comapny in the US on the side, they just hold all tentative to get visas. O1 are still doable, but all H1B are on hold. If you are canadian, it is not a problem.

But all Europeans that would like to get visa are on hold right now. People that already have one are in limbo, worrying about how the coming ruling will affect them.