...No, (ToFuture WiFi Smart Plug) is not  Home Kit compatible. ...
In the interest of further curiosity, testing and comparison, I've now ordered (from Amazon for $34.99) a "Koogeek Wi-Fi Smart Plug for Apple HomeKit with Siri Control Electronics Monitor Energy Consumption Indoor on 2.4GHz Network."
When it is set-up on my Network, using the iOS 10 Home app, I'll update about any noticeable differences (other than price) between this product and the ToFuture (UCsmart Home) smart plug.
