..., you should be able to tell Siri to control your devices. However, realize that Siri is a cloud service, and iOS may need some time to synchronize your device information with iCloud. One final thing to remember is that Siri will almost always prefer its default phrase handling over HomeKit devices. For instance, if you name your Sonos device "Radio" and try saying "Siri, turn on the Radio" then Siri will probably start playing an iTunes Radio station on your phone.