Depends what "good enough" means. Would he score 15 goals in a season? Probably not.
But could he contribute something as a squad player? I would say "yes", given we don't exactly have loads of options.
If we go up, I would try and sign him and Stewart on two year deals and try to sign one other high quality forward longer term.
One really strong CF, CM and CB to be priorities, to supplement what we've got, and a full back or two.