5v Power
The 5v power pins are connected directly to the BeagleY-AI power input and will capably provide the full supply current of your mains adapter, minus that used by the BeagleY-AI itself.
With a decent USB-C PD power supply, you can expect to pull about 1.5A depending on peripheral load. Devices that require high current - such as LED panels, long LED strips or motors - should use an external power supply.