Adobe has released a beta .DNG converter for .CR3 files from both the Canon EOS R5 and Canon EOS R6.
Support for the following cameras has been added. Visit the Camera Raw page for a complete list of supported cameras.
Canon EOS R5
Canon EOS R6
Nikon Z 5
Panasonic LUMIX DC-G100 (DC-G110)
Sony ZV-1 (DCZV1/B)
You can download Adobe DNG Converter 12.4 Beta here.