If he imposes the Stafford Act, Yes!
He can also just announce “Lockdown over, go back to normal”.
A whole lot of us only went along in the first place because he asked us to.
snipStafford Act Authorities and the Presidents Emergency Declaration
The Stafford Act authorizes the President to issue two types of declarations that allow the federal government to provide assistance to state and local governments in responding to an emergency. An emergency is any situation in which the President determines that federal assistance is needed to supplement State and local efforts to save lives and to protect property and public health and safety, or to lessen or avert the threat of a catastrophe . 42 U.S.C. § 5122(1). A major disaster, by contrast is any natural catastrophe that the President determines causes damage of sufficient severity and magnitude to warrant major disaster assistance. 42 U.S.C. § 5122(2).The Presidents March 13 letter to cabinet secretaries declared the COVID-19 pandemic to be an emergency triggering his Title V authorities, but left open the possibility that he may later declare a major disaster.
The major distinction between these two types of declarations is in the range of federal assistance that can be made available as a result of the declaration.
Under an emergency declaration, the President may direct federal agencies to use their resources to support state and local efforts, coordinate all disaster relief assistance, and assist in the distribution of medicine, food and other consumable supplies. Direct financial assistance can also be provided to state and local governments through congressionally-appropriated funds in the Disaster Relief Fund. This assistance generally is capped at $5,000,000 per emergency, but the President may authorize additional funds if he determines that (1) continued emergency assistance is immediately required; (2) there is a continuing and immediate risk to lives, property, public health or safety; and (3) necessary assistance will not otherwise be provided on a timely basis. 42 U.S.C. § 5193.
If the President subsequently declares a major disaster, additional federal assistance may be provided, including direct assistance to individuals and additional support such as crisis counseling services, relocation assistance, food distribution, and legal aid services, among other things.