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The Verizon USB Type-C Wall Charger with Fast Charge Technology can extend charging to Apple based devices including the 10.5-inch iPad Pro  using USB Power Delivery fast charging technology. To know how well they work together, we capture the USB Power Delivery protocol transactions using Granite River Labs GRL-USB-PD-A1 test software when connected over the Apple USB-C to Lightning Cable.

We can see after a hard reset, the Verizon USB Type-C Wall Charger with Fast Charge Technology shows that it supports 15 watts (5 volts @ 3 amps), 21 watts (7 volts @ 3 amps), 24 watts (8 volts @ 3 amps), 24 watts (9 volts @ 2.7 amps), and 24 watts (12 volts @ 2 amps) power profiles using USB Power Delivery.

With 1% charged battery, the 10.5-inch iPad Pro starts to request 15 watts (5 volts @ 3 amps) which is accepted by the Verizon charger.

Later we also observe 24 watts (12 volts @ 2 amps) power contract being established between the 10.5-inch iPad Pro and Verizon USB Type-C Wall Charger to speed up charging.

When first connected on a 1% dead battery state, the 10.5-inch iPad Pro initially pulls quick current up to about 2.7 amps at 5 volts. The current drops quickly to zero during a hard reset, but as the iPad starts booting up, USB Power Delivery negotiation occurs, resulting in charging at around 10 watts (5 volts @ 2 amps).

As the 24 watts (12 volts @ 2 amps) power request takes place, after a few seconds, the voltage increases to 12 volts while the current pulled stays at 2 amps to eventually settle out at around 24 watts (12 volts @ 2 amps) charging with the Verizon USB Type-C Wall Charger. 

It's good to see that a third party non Apple charger like the Verizon USB Type-C Wall Charger with Fast Charge Technology can use USB Power Delivery to effectively charge the Apple 10.5-inch iPad Pro at much higher power than using the 12W USB power adapter originally shipped with the iPad.