Yes. It will be compatible with those devices and you can charge them all at the same time.

We recommend connecting the iPad Pro, 12.9-inch (5th generation) first to get the maximum wattage and then followed by the iPhone 12 and then the Nintendo Switch.

This is important as the charger prioritizes the first connected device and the iPad Pro, 12.9-inch (5th generation) is the device that needs more wattage compared to the other devices.