The Model Y is still on the 2020.5 branch of updates, while the dash cam viewer was released in 2020.12.6. It will take a few more weeks (hopefully sooner) for them to move the Model Y into the main software branch with the rest of their models. Right now the 2020.5.X updates are just small bug fixes (i.e. HVAC sync, etc.) but not adding new features.
FYI - The name of the updates tell you when they are released - (year).(week). So 2020.5 is a late Jan / early February software release/code, while the current 'main' version is based on mid-March.