I think USCIS might have send out all the receipt notices to the petitioners by now, as the delay expected was around 4-8 weeks of filing.
For some reasons, USCIS might return the packages back to the petitioners and petitioners can resubmit it with required amendments or additions, provided the cap is still open. Since your petition was supposed to be filed on 11th April, your employer might have got enough time to resubmit the application before the 11th June cap date.