There is not definite time after the interview to receive your final decision. The good news is that you should be eligible to file for an EAD for work after 150 days have elapsed since your I-589 acceptance by the AO.
Also, there is absolutely not a soul who could give you a percentage of the outcome as each asylum case is uniquely distinctive and the USCIS AO will review it on its merits, credibility, corroboration and the testimony given during the interview.
Please understand that asylum relief is not automatic and must meet very specific statutory criteria. Despite what other people received, your case is unique and will be considered on merits in due time.
If everything else fails, seek assistance from your attorney of record.
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