Yes it is here with Siri and Alexa. It isn't great yet though. How many times have we asked Siri or Alexa for something only to have them totally screw up and waste our time. All too often they get it wrong, and I find myself having to type in my search arguments anyway. :-(
Well, on a personal note, i live with my grandparents, and i believe the voice search has helped them a lot as they find the typing part quite a task. So all in all it is useful in minimising the gap between generations.
Voice Search but don't think, it will be benefit for 3rd parties like website makers and SEO guys.
Virtual Assistants like Siri, Google, Amazon will rather deliver ready, custom crafter responses instead let 3rd parties to benefit.
"What happened in the NJ yesterday", assisant will reply with the most important info or even correct with the political line of Google.
It will not give you a chance to check 3rd party sites from this. Why to do it?