that's about it
That is pretty much everything; there is nothing or not much else to say. That's about it. Would anyone like to add anything before we end the meeting? A: "Anything else you'd like to include in your testimony?" B: "No, that's about it."
that’s about ˈall/ˈit
used to say that you have finished telling somebody about something and there is nothing to add: ‘Anything else?’ ‘No, that’s about it for now.’