The Secretary shall establish a payroll support program and enter into agreements with employers who meet the eligibility criteria specified in subsection (b) and are not ineligible under subsection (c), to provide public contributions to supplement compensation of an eligible employee group. There is appropriated for fiscal year 2021, out of amounts in the Treasury not otherwise appropriated, $3,000,000,000, to remain available until September 30, 2023, for the Secretary to carry out the payroll support program authorized under the preceding sentence for which 1 percent of the funds may be used for implementation costs and administrative expenses.