I had similar status with my meds, after pending they sent a request to extend my meds and after they got extended my med status changed to passed.
As for the security check - this remains the biggest mystery to me. After reading other posts and GCMS notes of people who have received their PR, it is safe to conclude that the status of security check will never show as passed, they just redact anything that pertains to security in the notes as it is a confidential government info. So it's really hard to understand whether the security check in underway, although it's showing as not started or if it's truly not started.