Sure, you could check your watch, estimate your ETA and type out your message old-school, or you could create iPhone text shortcuts to do it for you.

The Shortcuts app provides access to a huge number of existing shortcuts, along with the ability to create and run your own ...

These can be used to create the installer as well as the shortcuts. Both require you to create scripts, but are pretty easy to understand if you look at the examples.

You don’t need any complex software or third-party apps. Make your computer life easier by adding keyboard shortcuts to your Apple computer.

Apple's "Remember This" shortcut helps you to keep a tracking of everything you do on a daily basis in order to prevent you from forgetting things to do.

Alternatively, if you have the app, be sure to update it to the latest version. After this, follow these steps to create the shortcut: Open the Shortcuts app on your iPhone.