The Administration shall be the central coordinating and directing agency of all social service activities in the State, including: child welfare services; and any other social service activities financed wholly or partly by the Administration. For the purposes of these duties, child welfare services provided to a minor may continue after the minor’s eighteenth birthday but not beyond the minor’s twenty-first birthday. The Administration shall supervise, direct, and control the activities of the local departments that it finances wholly or partly. The Administration shall supervise all public and private institutions that have care, custody, or control of abused, abandoned, dependent, or neglected children, except: institutions under the authority of the Department of Juvenile Services; and agencies, persons, or institutions designated by the Department of Juvenile Services under § 9-217 of this article. The Administration may visit any State-aided institution, organization, or agency engaged in social service or welfare activities and inspect thoroughly its management, buildings, and equipment. Visits and inspections under paragraph (1) of this subsection shall be made: at reasonably convenient hours; and with reasonable regard to the established discipline, regulations, and customs of the institution, organization, or agency. As desirable or necessary for the purpose of this title, the Administration may designate existing agencies or organizations in the State as the Administration’s agents. Before the start of each regular session of the General Assembly, the Administration shall submit a report of its activities to the Governor.