it’s been exactly since 440 days since my interview no outcome

167 days and a long wait post interview is not uncommon. Hang in there because it could be a long wait

had interview on 18th of March, no update

Based on the timeline provided you are still within the window for when USCIS will issue a decision on your case in the interim you may want to make sure your mailing address is still current with USCIS so you do not miss any mail communication from them. If you have any other questions, feel free to ask them in our next Lawfully office hours session! - Attorney MaryJoy Chuba (All information shared here is for general educational purposes only. It does not constitute legal advice or create an attorney - client relationship. Your situation may require fact-specific guidance. For personalized legal advice, please consult an immigration attorney directly.)