Welche Bedeutung steckt hinter der hier vorgestellten Vokabel aus dem Bereich Talking with colleagues?

Olivia: 'I'll be off then. Have a nice weekend, and I'll see you next Wednesday.' Peter: 'Have a great trip. Bye!'

I'll be off then

Do you know what it means?

• I've switched my voicemail on
• It's my turn to buy the drinks
• I'm leaving now