• Iran's Foreign Ministry spokesperson Esmaeil Baghaei stated that the memorandum of understanding with the United States would not be signed on Sunday, though he did not rule out the possibility of it happening in the coming days¹².
• The spokesperson specifically said, "We have to wait and see about the exact time of signing; although it will not be tomorrow," and added that "the possibility of this happening in the coming days cannot be ruled out"¹.
• The claim accurately captures the substance of the spokesperson's remarks, though he used slightly stronger language ("will not be signed") than the claim's characterization ("unlikely").
• The eventual signing ceremony was later scheduled for June 19, 2026, in Switzerland, confirming that an agreement was indeed reached within days after the Sunday in question³.

Overall validity: 95%

1. Instagram
2. Will the US-Iran deal be signed on Sunday? What we know so far
3. The signing ceremony for the U.S.–Iran peace agreement is scheduled for June 19 in Switzerland.