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The cool thing about USB Power Delivery support with the Apple iPad Pro is that you can use other non-Apple chargers that support USB Power Delivery technology.  

The Apple iPad Pro normally uses 29 watts (14.8 volts @ 2 amps) to get the fastest charging from Power Delivery charges like the Apple 29W USB-C Power Adapter as shown in this review but it still also supports slower 5 volts based charging.

Here we tried charging the Apple iPad Pro with the Verizon USB Type-C Wall Charger with Fast Charge Technology connected with the Apple USB-C to Lightning Cable.

Using Granite River Labs USB Power Delivery test software, we can see that theVerizon USB Type-C Wall Charger with Fast Charge Technology repeatedly advertises its support of 5 volts @ 3 amps (15 watts), 7 volts @ 3 amps (21 watts), 8 volts @ 3 amps (24 watts), 9 volts @ 2.7 amps (24 watts), and 12 volts @ 2 amps (24 watts) power profiles.

The Apple iPad Pro finally only requests 5 volts @ 2.4 amps from the Verizon USB Type-C Wall Charger with Fast Charge Technology.

Here we can see the Verizon USB Type-C Wall Charger with Fast Charge Technology providing power to the Apple iPad Pro with the voltage eventually getting to 5.3 volts and current reaching 1.9 amps.