You will just have to wait and see what the IRS says. Don't do anything until they ask for it. The entire return should have been mailed and signed with your name as personal representative of the deceased as instructed in the IRS publication. There is no way to sign an e-filed return properly.
Suggest that you read IRS Pub 559 (Survivors, Executors, and Administrators) for a lot of good information about filing and signing the final return and estate return and other requirements.
https://www.irs.gov/pub/irs-pdf/p559.pdf
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**