Google Assistant introduced multi-stage routines earlier this year, allowing a combination of actions (lighting switching, thermostat changing, etc.) to be performed with a single command. At the time, it was said that Google planned to schedule routines, but no timeframe was specified except for "later this summer". Now, as [DroidLife discovered on Reddit in it looks like this. The schedule function is introduced.
Since yesterday, some users have seen the option displayed in the Google Home app. Tap Settings, then Routines, and then tap the + button to create a routine. If it's available to you, the "Set time and day (optional)" option should also be turned on.
This should be extremely helpful for users who are actively working the routines. You can set Google Home's Morning Routine if you wake up each day and initiate actions such as turning off the phone and automatically adjusting the lights instead of the daily job interview with Google.
In order for the scheduled routines to run, a Google Home device must be selected to perform the actions. Once a device has completed a routine, it will give an audible confirmation and notify you on your phone.