Same situation with me. Everything else passed just security in processing since March 2023. Contacted my MP too but not much help. "Your application is in processing, background check is done by third parties so there's not much IRCC can do about it. I'll give it a little more time". Also, applied for CBSA notes to see any progress but they're also stuck somewhere. I supposeMy application stop at background check since March
No emails, no updates