Android 13 is planned to start in December, but OPPO was so far testing beta versions only in selected countries (mainly Asia). Therefore if you are living elsewhere I suspect it will come by the end of Q1 or during Q2 2023.
I would like to put a reminder here that we all should be civil to each other during any discussion on XDA. I fully understand the frustration when your issues could not be solved easily or others XDAers just post a questions without any searcing in the forum. I feel you and I got mad some time too, but that should not stop us from helping each other ... in a gentle way.
Feel free to report any spam posts or rule violating posts to moderators and we will clean the threads to keep it on topic. Thanks.