Set varying alarm with Google Assistant to wake me up by turning a switch on or off?

I am trying to be able to tell Google Assistant to turn off a switch at a certain time in the morning (time varies each day) in order to wake me up. The switch is attached to a white noise machine and it is an effective alarm for me. I know I can schedule it through various smartapps, but the time is not always consistent.

I am able to turn on and off the switch by way of Google Assistant, but as soon as I tell it to do so at a specific time, it just gives me a web search result.

Is there an app that will allow me to essentially set an alarm, just as I would on my cell phone?