Is there a shortcut for Siri
Is there a shortcut for Siri on Smart Keyboard with Ipad Pro?
If your iPad Pro is a 9.7" model, you can always set up and use "Hey Siri" as explained here:
Use Siri on your iPhone, iPad, or iPod touch - Apple Support
If your iPad Pro is a 12.9" model, you can also set up "Hey Siri", but the iPad would have to be plugged in for this feature to be active.