iolinux333,
I have the same want. I got a Series 3 watch for Christmas and it's nice to be connected even without my phone. I've gotten one item, my August lockset to work via the watch & by voice, by setting up an Apple Home on my AppleTV with only one item, the lock. This way I can at least unlock the door by voice when I want to.
Much of the rest is done by my SmartThings installation. For example, when my phone gets within about 250 feet of the house, the locks automatically open or if I'm leaving they lock when it I hit that point. I have routines setup that appear on the watch and let me turn lights on and off by press but not by voice. I'm waiting for the new iOS Alexa app that fully supports voice commands and hoping that it will eventually have a watch incarnation.