; and (B) the termination of the order of suspension described in subsection (a) shall be delayed until the date that is 30 days after the date on which such plan is submitted to the appropriate committees of Congress. 6. Resumption of border wall system construction (a) Border wall system construction (1) In general (A) Immediately resume border wall system construction Not later than 24 hours after the date of the enactment of this Act, the Secretary of Homeland Security shall resume all activities related to the construction of the border wall system along the international border between the United States and Mexico that were underway or being planned for before January 20, 2021. (B) No cancellations The Secretary of Homeland Security may not cancel any contract for activities related to border wall system construction described in paragraph (1) that was entered into on or before January 20, 2021. (C) Use of funds The Secretary of Homeland Security shall expend all funds appropriated or explicitly obligated for border wall system construction described in paragraph (1) that were appropriated or obligated, as the case may be, on or after October 1, 2016. (D) Implementation plan Not later than 30 days after the date of enactment of this Act, the Secretary of Homeland Security shall submit an implementation plan to the appropriate congressional committees for the completion, by not later than September 30, 2024, of the border wall system construction described in paragraph (1) and funded in accordance with subparagraph (C). (2) Plan to complete tactical infrastructure and technology elements of border wall system Not later than 90 days after the date of the enactment of this Act, the Secretary of Homeland Security shall submit an implementation plan to the appropriate congressional committees that includes quarterly benchmarks and cost estimates for satisfying all of the requirements of the border wall system construction described in paragraph (1)(A), including tactical infrastructure, technology, and other