You can set up business hours for texting too. If you're away, let your clients know by setting up your business hours which then sends an automated reply to those attempting to reach you outside of your availability.
Steps to set this up
Go to your Settings > Business Hours
Toggle your Status On
Select your Timezone
Customize your Business Days and Hours to your availability.
Then insert your personalized auto-reply and hit save!
When a contact sends a text to your SMS number outside of your business hours, they'll receive your away message. They will know their message was delivered and to expect a response soon.