Canon has release Digital Photo Professional Express for iPad. It allows you to import and process .CR3 files on Apple iPad.
“For portable and wireless digital photography workflows, Canon’s Digital Photo Professional Express (DPP Express) brings the powerful features of Canon’s DPP software to your compatible iPad. Working with Canon’s Camera Connect app*, DPP Express streamlines the processing of JPEGs and .CR3 RAW files with an intuitive and powerful interface. View images and adjust settings right on your mobile device, and save files to the cloud, a computer or your camera. With DPP Express, it’s incredibly easy to maintain a wireless RAW workflow on the go.
To create and compare different versions of the same image, DPP Express enables Multiple Editing Histories. Helpful in differentiating and comparing effects or setting changes on the same image, this feature creates up to four editing histories to view and save. To apply the same set of corrections to different photographs, Edit Histories can even be copied and pasted among images using the DPP Express Copy and Paste adjustment functions.”
DPP Express is limited to use with iPads that have 2GB of RAM or more, specifically: iPad Pro all models/iPad(6th) /mini 4/Air 2. You can download it here on the App Store.
And yes, this is iOS only for now. No word on development for Android.