The best case scenario you’d expect after admitting to having plagiarized some content is for a signature ban for a certain period of time, on the remote chance that your ban appeal on Meta were to be considered. 

There is an interesting thread that used to keep a non-official status on ban appeal efforts, although unfortunately it was discontinued. Nevertheless, it gives you some insights on the procedure and results: [BAN APPEAL]UPDATE: Total table + Ban status (Need feedback from Global mods).