You can specify a status message that's visible to all your contacts and appears in your profile card and at the top of the chat compose box when someone sends you a message on Team Chat. You can change this text as often as you'd like and set how long it should be displayed. Use your status message to provide a personal note, time zone or location information, or include more detailed information about your status.
Your status message syncs across all your signed in clients and apps. In other words, changing your status message on the mobile app will apply it to the desktop app.
Requirements for setting a note on your Team Chat profile