The town’s highest elected official said Monday that the cell tower proposed for northwestern New Canaan could be built in the first half of 2022. Planned for a wooded hill at Ponus Ridge and Dan’s Highway, the proposed cell tower application likely will go through an “accelerated process” because the state agency that fields such applications hasn’t been busy, according to First Selectman Kevin Moynihan. “They are doing engineering work now and planning and then it will be packaged together to go to the Siting Council, my guess is by midsummer,” Moynihan said during a regular meeting of the Selectmen’s Advisory Committee on Buildings and Infrastructure, held via videoconference.