For H-1B rejection, when will I be officially notified?

Suppose that, which I am expecting, my H-1B will be rejected. When will I be notified (which gives me 60 days to work in the US thereforth)? Mine is premium processing…

Per USCIS, we need to wait atleast for mid-May for them to return the package

When is the F-1/OPT expiring?