Cognizant — offer letter not received after 3 month of interview

Address: Kapurthala, Punjab

I attended an interview at CTS on April 6th 2019 in Lovely professional University Phagwara punjab and cleared all the rounds and ended up with HR discussion round on same day. At the end HR informed me that I will receive my offer letter within 10days but I haven't received yet. I am not sure if normally they would take almost 3 month to release the offer letter. Please let me know, when can I expect my offer letter.
Mukesh Yadav
[protected]@gmail.com