Per the MOU text, Iran receives significant financial relief/reward immediately — even before any final agreement; see:
10. The United States undertakes that immediately after the signing of this Memorandum of Understanding, and until the date of the lifting of sanctions, the United States Treasury Department will issue waivers for exports of Iranian crude oil, petrochemical products and their derivatives, and all related services, including banking, insurance, transportation, and the like.
11. The United States undertakes that, in light of the progress of negotiations towards a final agreement, frozen or restricted funds and assets of the Islamic Republic of Iran will be released and made fully available. These funds, whether held in the master account or transferred, will be used for any final beneficiary payment determined by the Central Bank of the Islamic Republic of Iran
This is the text. Different sources so far have confirmed this is the text.