That’s about all
Definition 1 of 1
Pro Tip 1/3Informal Usage
The phrase is casual and usually used in informal conversations or writings. 
We've covered the main points, that's about all.
Pro Tip 2/3Finality
Indicates that a discussion, list, or activity is complete and nothing is left to be mentioned or done. 
We've reached the end of our tour, that’s about all.
Pro Tip 3/3Non-literal Use
Sometimes used humorously to understate a large amount of information or items. 
He's an astronaut, speaks six languages, and paints – that's about all.