And when will the self driving car be able to orthogonal park a trailer by backing down and alley?

I don't know what that means. But presumably you are talking about some difficult technical feat that one can perform with a vehicle?

I'm fairly sure, if it's something mechanical and a human can do it, the computers won't be far behind. But even if not, we can redesign the vehicles to make it easier for a computer, eg we can make all axes or even all wheels independently steerable and control their velocity individually. A human would be overwhelmed with that, they can barely keep hold of a steering wheel, but a computer wouldn't mind too much.