http://www.techradar.com/news/google-assistant-has-now-arrived-on-the-nvidia-shield-tv

With the release of a brand new software update, Nvidia has brought Google Assistant support to its Android-powered Shield TV. 

With this integration, Shield TV owners can now enjoy hands-free control of their media, perform voice searches and control their smart home. In fact, it sounds very much like the Shield TV is now a viable Google Home alternative, able to do everything the smart speaker can do with the exception of a small number of features such as set timers and make phone calls.