How to set Out of Office Message in Chatter in Salesforce Lightning Experience

This post explains how to set up out of office message in chatter.
This features only available in Lightning Experience.

Path:
From Setup, enter Chatter Settings in the Quick Find box, and then Select Chatter Settings
Check Users can set Out of Office messages and then save the settings.

Once you enable the Out Of Office message check box in chatter settings.
Go to your chatter profile click on Out Of Office button.

Enable Set Out of Office message Checkbox.
Enter start date, end date
Leave the message as it is, or customize it.

Once you save the Out of office message, it will show the message as like this.

That's it.

Resource:
https://help.salesforce.com/articleView?id=collab_admin_out_of_office.htm&type=5