According to the report from the Mail, a resolution might not come until the end of the following season, which is when Guardiola's current contract is set to expire. It is acknowledged that the procedure, which has been extremely private so far, is presently at the phase where witness statements are being obtained; which will probably continue until the spring of next year.
If the trial proceeds as scheduled, a decision would probably be made in the summer of 2025. On the other hand, delays might cause the process to drag on longer. It would be impossible to conceive a scenario in which City would not appeal, should any side deem the final result unacceptable. A situation like that would stretch out the process even further.