473.333.  Investment of liquid assets. — Except as restricted or otherwise provided by the will of the decedent, on or after August 28, 2009, the personal representative shall, without authorization or approval of the court, invest liquid assets of the estate, including funds received from the sale of other assets, other than funds needed to meet debts and expenses currently payable, in accordance with the provisions of the Missouri prudent investor act, sections 469.900 to 469.913, subject to the following exceptions:

  (1)  Investment of any part or all of the liquid assets:

  (a)  In direct obligation of or obligations unconditionally guaranteed as to principal and interest by the United States; or

  (b)  In interest-bearing accounts and time deposits, including time certificates of deposit, in financial institutions to the extent the account or deposits are insured by the Federal Deposit Insurance Corporation, shall constitute prudent investments;

  (2)  If the personal representative determines it appropriate to delegate investment and management functions to an agent as provided in section 469.909, the agent to whom the delegation is made shall acknowledge in a writing delivered to the personal representative that the agent is acting as an investment fiduciary on the account.