Help , F1 to H1 while awaiting OPT ?

[asdasd]

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Hey guys, plsss help me
I have a situation:

I am on F1 visa, applied for my OPT (which should be here in may end). I am graduating in may end as well (masters).

1. Can my potential employer apply simultaneously for my H1 right now before my OPT arrives?
2. Is that doable? Or am I supposed to wait for OPT..and then only file for H1 ?
3. Can OPT and H1 process simultaneously (USCIS) ?

Pls pls let me know.

thx.