don't know why you'd wanna but hey you might
How to schedule texts in Google’s Messages app
Draft a new text in Google Messages.
When you’re ready to set a delivery time, long-press the “Send” button to open the text details menu.
If you want to pick a more specific time, than the backed in options, tap “Select date and time.”
Set the day and hour when you want the text to be sent.
Tap “Save” to confirm the delivery time
@ecksmc do you know if version specific. I tried it and didn't work for an SMS or MMS 🤔
@Kurtroedeger just done a bit of checking
"Don’t worry if you don’t see the new scheduling options in Google Messages yet. Google isn’t flipping the switches at the same time for everyone, so to speak. Some users will have to wait a bit longer for the scheduler to appear"
The feature is rolling out as a server-side update for all Google Messages users, meaning you don’t have to download anything to use it