I doubt this.
Target uses Workday for employee management. While yes, Workday DOES have features for scheduling, I assume it costs significantly more than myTime. Otherwise they wouldn't have spent so long remaking it. Do you guys remember the old myTime website, or even worse, the UKG / Kronos app.
iirc, Kronos uses sales in some way shape and form to auto generate those schedules. I don't think Workday has that, and if it does, I doubt they'd wanna give ever store's sales information to a vendor since Workday isn't self-hostable.