Reading the live feed from Caltrans...
Read them in sequence, north to south, and you can watch the weather change along the drive before you start it. These are Caltrans still images, refreshed by Caltrans on its own cadence, not a live video feed.
Conway Summit and Lee Vining conditions, cameras, and chain controls will show live here from Caltrans the moment the feed answers. Until then, check Caltrans QuickMap for the official word before you drive.

Lee Vining · 8,149 ft · Caltrans still image

June Lake · 8,031 ft · Caltrans still image

Mammoth Lakes · 7,529 ft · Caltrans still image
Road, weather, and camera data: Caltrans District 9, the California Department of Transportation's Eastern Sierra district.