Canon R50 has a Canon RF lens mount and currently there are 104 native lenses available for this mount.
The latest released lenses that are compatible with the R50 are the Brightin 14mm f2.8, the Canon RF 20-50mm F4 and the Brightin 11mm F2.8.
Canon R50 doesn't have a sensor based image stabilization system but
38 of these lenses already comes with optical image stabilization.
Since Canon R50 has a APS-C sensor, it has a focal length multiplier of 1.6x so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on R50.
You may also also be interested in these:
Canon R50 Lenses with Image Stabilization
Canon R50 Lenses with Weather Sealings