I am very sorry for your loss @Jim_Carmody.
The estate is not required to file a federal income tax return (Form 1041) unless it had gross income for the 2021 tax year of $600 or more.
See https://www.irs.gov/instructions/i1041#idm140229151947712
You might want to seek guidance from local legal counsel to ensure matters are wrapped up properly.
See https://www.avvo.com/probate-lawyer.html
