with my aggression".
Probation staff generally want to convince a court that it's worth trying non-custodial options. If they can write "Mr Bloggs has recognized that he has a problem controlling his aggression and has shown his willingness to participate in a suitable course", then they'll do so. However, they won't lie. If Mr X has already attended three such courses, with no signs of improvement, the probation staff might write, "Reluctantly, the probation service is forced to accept that all non-custodial options have been exhausted". That's not the same as actually recommending prison; it simply accepts its inevitability.
That type of report usually takes at least 3 to 4 weeks to compile and present to the court. (A copy is sent to your legal representative before the sentencing hearing). Additional time might be required if the court, or the probation service, wishes to receive external reports (e.g. psychiatric reports)
Chris