All moneys actually in the treasury to the credit of the fund from which they are to be drawn, and all moneys applicable to the payment of the obligation or appropriation involved, that are anticipated to come into the treasury before the maturity of such contract, agreement or obligation, from taxes, assessments or license fees, or from sales of service, products or by-products of any Municipal undertaking, and moneys to be derived from lawfully authorized bonds, sold and in process of delivery, shall, for the purpose of such certificate, be deemed to be in the treasury to the credit of the appropriate fund, and shall be subject to such certification.