Yes, Thinkorswim works on Apple-made devices. According to the application's official web page, the tool works on Windows as well as on Mac version 10.10 or newer, but if you want the Power User license you'll need to have at least MacOS 10.10.5.
In case you have any additional system or hardware requirement-related questions for the application, I recommend checking out Thinkorswim's system requirement page.