Mets hint at call-up time for stud lefty Steven Matz

Steven Matz Photo: Anthony J. CausiPHOENIX — In the muddled equation of the Mets’ starting rotation, much of the intrigue surrounds a pitcher who hasn’t arrived yet.

But the consensus among team officials is Steven Matz will be wearing a Mets uniform at some point before the All-Star break.

The fact Matz — a stud pitching prospect at Triple-A Las Vegas — hasn’t been promoted already has raised a few eyebrows even within the organization as the Mets tread water with Jon Niese and Dillon Gee, but general manager Sandy Alderson told The Post there are factors that need to be considered.

Left unsaid was the approaching Super-2 cutoff for arbitration eligibility — the safety date is thought to be…