Realistically, how big is the Lions SB window?

Ben Johnson and Glenn are both likely to find HC gigs, Goff is 30 if that means anything. On the other hand though their defense has been banged up and will be returning fully healthy come next season, and afaik they won’t need to pay anyone big money this upcoming offseason (correct me if Im wrong.)

This year was supposed to be their best shot at a SB, how big is their SB contending window?