Supports 30w charger with safety

Assuming that you are using a standard USB Power Adapter, you can safely use a 30W (or greater) Power Adapter. You iPad will only draw the power that it requires.

Your iPad Pro 10.5 supports USB-PD (Power Delivery) Fast Charging when used with a compatible Power Adapter. When using a suitable Power Adapter, your iPad will charge at its maximum supported charging rate of 18W (i.e., 1.5A @12V or 2A @9V). When used with a non PD-compliant Power Adapter, the iPad will charge at a maximum 12W rate (2.4A @5V).

Be aware that Apple devices are not compatible with the competing “QC” (Quick Charge) standard.

Assuming that you are using Apple Power Adapters, compatibility with your iPad is assured. Many users (myself included) routinely use a 30W Power Adapter. Whilst this Adapter can supply more power than the iPad itself can use, the Power Adapter is less stressed and runs cooler when charging the iPad at its maximum rate - potentially extending the operational life of the Power Adapter. The higher wattage is also useful for fast charging of a Power Bank (in my case, a Mophie PowerStation USB-C 3XL) - also regularly used when away from an AC outlet.

In summary, if using an Apple Power Adapter, anything greater than 12W is completely safe to use with your iPad. Other high-wattage standard USB or USB-PD Power Adapters are also completely safe to use. The Apple 30W adapter is recommended.

I hope this information and insight proves to be helpful to you.