The sentencing of former Parktown Boys’ assistant water polo coach Collan Rex is expected to be handed down on Wednesday morning at the Palm Ridge Magistrates Court.
Rex has been convicted of 144 counts of sexual assault and 12 counts of common assault.
The court has acquitted him of more than 140 other counts due to a lack of evidence.
The former polo coach has been acquitted of charges including attempted murder, rape, sexual grooming and exposing minors to pornography.
Last month, acting Judge Peet Johnson said Rex was an open and credible witness who accepted responsibility for his crimes.
Johnson said based on the former assistant coach’s own admission in court, he has no reason to reject his evidence about the abuse.
The judge said he found some witnesses who testified to be unconvincing and doubtful.
Rex has also been convicted on 12 counts of common assault.
Protesters are gathering at court ahead of the sentencing.
Protester Rozanne Sack from Koleinu South Africa said: “These perpetrators enable the secrecy; they master-manipulate the victims to keeping quiet. So, the fact that it came out and there can be some sort of justice for these boys is very heartening for us.”