What needs to be done if we do not receive our Schedule K-1 prior to the extension deadline?

One of our financial investments that provides us with a Schedule K-1 filed for an extension. We have yet to receive the Schedule K-1.

 

What do we need to do if we do not receive the Schedule K-1 prior to the October 15 filing date?

 

We have already paid the estimated taxes.

We have filed an extension with our state. What do we need to do to for the state as well?

 

Thank you.