Egress window

An egress window was installed at an existing basement window location (30" wide). There is a 2 x 6 bottom plate and a 2 x 10 band joist that spans the opening. One floor joist sits above the opening (runs perpendicular to the band joist). Is a header required?

How many stories bear upon the 2x10 band board? Is there a roof load bearing on it as well?

Single story home and the window is on an exterior wall supporting roof. Existing window has been in place for 50+ years with existing supports.