H1B Extension Case Status - Notice Explaining USCIS Actions Was Mailed

[DD1234]

Hello Everyone, 

My employer file my H1B extension in premium on 7th Feb. Please see below my case status.
Notice Explaining USCIS Actions Was Mailed
On February 21, 2023, we began reviewing your Form I-129, Petition for a Nonimmigrant Worker, Receipt Number IOE*******. We mailed you a notice informing you of the action we intend to take on your case. Please follow the instructions in the notice and submit any requested materials. If you do not receive your notice by March 7, 2023, contact the USCIS Contact Center at www.uscis.gov/contactcenter. If you move,go to www.uscis.gov/addresschange to give us your new mailing address.

What is the meaning of case status? RFE or NOID. 

Thanks,