Did Iran already transport nuclear reserves, American attack was useless?

The United States attacked Iran’s three nuclear bases with bunker buster bombs, after which the US and Israel celebrated Iran’s nuclear capacity. However, the Director General of International Atomic Energy Agency (IAEA) Rafael Mariano Grasi made a statement before the United Nations Security Council that there has been no increase in radiation levels after the attacks on three Iranian nuclear bases including the Fordo Uranium Promotion Center;