I have heard it plenty of times, it is one of the favorite ‘temple stories’. It has often been referenced in conference talks as well as LDS church history manual (official).
Ezra Taft Benson, “The Faith of our Founding Fathers,” 21 said this...
Shortly after Spencer W. Kimball became president of the Church, we met together in one of out weekly meetings. We spoke of the sacred records that are in the vaults of the various temples of the Church. As I was soon to fill a conference assignment to St. George, President Kimball asked if I would go into the vault at the temple and check the early records. In so doing, I realized the fulfillment of a dream I had had ever since learning of the visit of the Founding Fathers to this sacred place. I saw with my own eyes the records of the work that was done for the Founding Fathers of this great nation, beginning with George Washington. I was deeply moved on that occasion to realize that these great men returned to this promised land by permission of the Lord and had their ordinance work done for them. If they had not been faithful men, if they had not been God-fearing men, would they have come to the elders of Israel to seek their temple blessings? I think not. The Lord raised them up, sanctioned their work, and proclaimed them “wise men.” Moreover, a president of the Church declared them to be the “best spirits the God of heaven could find on the face of the earth,” and testified that they were “choice spirits” and “inspired of the Lord.”
“And there in the St. George temple I saw what I had always hoped and prayed that someday
I would see. Ever since I returned as a humble mi
ssionary and first learned that the Founding
Fathers had appeared in that temple, I wanted to
see the record. And I saw the record . They did
appear to Wilford Woodruff twice and asked why
the work hadn’t been done for them. They had
founded this country and the Constitution of this la
nd, and they had been true to those principles
....
In the archives of the temple, I saw in a book, in bold handwriting names of the Founding
Fathers and others, including Columbus and other
great Americans, for whom the work had been
done in the house of the Lord... .All these appeared
to Wilford Woodruff when he was President
of the St. George Temple. President George Wash
ington was ordained a High Priest at that time.
You will also be interested to know that accord
ing to Wilford Woodruff’s journal, John Wesley,
Benjamin Franklin, and Christopher Columbus we
re also ordained High Priests at the time.”
(TEACHINGS OF EZRA TAFT BENSON
p. 603-4.)
I can give you other references as well.
My impression is that you seem to fall into the category of those who lie to deceive because they they need to make the LDS church seem ‘normal’.
More sources from current LDS manuals - for someone with the screename ‘justthetruth’ you haven’t been telling it.
https://www.lds.org/search?lang=eng&collection=manuals&query=signers&x=0&y=0