In order for you to play Tabletop Simulator on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
macOS 10.12+
Processor (CPU):
SSE2 instruction set support.
Memory (RAM):
4 GB RAM
Graphics Card:
Graphics card with shader model 4.0 capabilities.
Network:
Broadband Internet connection
Storage:
3 GB available space