The U.S. will be capable of defending “the entire nation” against ballistic missiles and other aerial threats via Golden Dome by summer 2028, and grow the architecture by 2035 to address the full range of threats as defined by the Defense Intelligence Agency, the Golden Dome director said

U.S. Space Force General Reaffirms Tight Timeline For Golden Dome | Aviation Week Network
The DOD is following a strict schedule to deploy an initial Golden Dome for America capability in just more than two years and an expanded architecture by 2035.