TN Visa Approval - Engineer Category/Manager Position

TN VisaCase Info.
Background:Citizen of Canada. Initial TN. Previously was permanent resident of U.S., but abandoned green card a few years ago. Would reside in Canada and commute to U.S. for new job in the U.S.
TN Category:Engineer
Job title:General Manager – Operations at a manufacturing / processing facility
Education:Bachelor’s degree in Chemical Engineering
Filing Process:TN visa status application @ USCBP - Peace Bridge, POE
Processing time:Approved same day filed
Approval period:3 years