I guess we could quibble over whether autonomous means "Not needing
direction, it will do the job without any help from me," or
"self-directed, able to make decisions on its own." Most industrial
robots are programmed to perform a fixed series of movements, same way
every time. I'd use autonomous for, say, a robot that inspects an engine
block and decides where it needs further machining and does it. DARPA
talks about "autonomous vehicles" where you give it a set of GPS
coordinates and it goes there, but figures out the route for itself and
doesn't hit any pedestrians along the way.
Today's robots -- if you count the ones that are still in labs -- run a
continuum from really stupid on up (with a side category for ones that
have no programming at all but are just remote-=controlled by humans).
What we don't have yet, and what the TV show is apparently about, is
self-awareness.