Yes! The Osmo iPad Base and all Osmo games are compatible with the iPad Pro 10.5-inch device, even if the product packaging does not list this device.
Note that the minimum iOS version needed is 10.
Here is a complete list of Osmo-compatible devices:
https://support.playosmo.com/hc/en-us/articles/115010156067-What-devices-is-Osmo-compatible-with-