I lived in Silicon Valley for ten years, right in the heart of where all the big tech companies have their hqs, we saw all the new processes and applications first, there are always people out and about testing out new devices before they hit the market, apps are sent out to local industry to be beta tested, we saw them trying out the first self-driving Google cars on the streets etc. Lots of supporting industries in the area too, CNC machining and the like.
Right there is where you can already see the winds of change in the working demographic Professor Hawking talks about. It's more noticeable there but, if you're in a traditional middle-class, middle management, middle income job in the engineering, manufacturing production industries yes, I'd be worried. There is a clear and growing divide between the elite tech jobs at the top and the jobs available to those without engineering and tech degrees. As automated and app based processes replace human personnel, at the top end you will get a few more IT geniuses, programmers, design engineers, developers earning a lot of money but fewer and fewer middle range jobs available. Losses are mostly in admin, company accounting, shipping and receiving and production management since the most current software can do everything from buying raw materials right through to balancing the bought/sold ledger needing only a handful of people to do data entry whereas before you'd need at least two or three times as many to do the stuff manually. Yes, there are others jobs becoming available but these are generally support and service industry jobs that are unskilled and therefore much lower paid.