Help me negotiating

Hi peeps, I am at Infosys and applied to Oracle via referral. I told that my official notice period is 90 days but can be negotiated to 60 days. I cleared all rounds of interviews. HR called me and said offer roll out would take 1-2 weeks time. Meanwhile talk to your manager and get a confirmation for 60 days release.

Now I am not sure what to do because there are 90% chances I won't get an early release (even though my project has not work).

Also I am not sure if tell Oracle HR, that I cannot join early, would it change the chances of me getting offer.

What am I assuming is she wanted to know whether I can get early release or not. If not, she might not send me offer. So I told her like "I can't communicate with my manager until I receive the offer as it would be a vague communication". But I am very confused what to do. Please help. I really want to leave Infosys.