Yes, both Touché as well as Touché SE can work without a computer. They act as USB MIDI class compliant devices when they don't detect our companion app running on a connected computer. The will need USB power, e.g. from a standard smartphone USB power supply unit.
Please be aware that Touché SE (Software Edition) offers far less connectivity, customizability and features in standalone mode. For details, please read here:
What are the standalone capabilities of Touché and Touché SE?