Parole option after a quarter of his sentence, not half.
Yes it seem the correctional service act makes provision for people doing less then 5 years
Correctional Services Act 111 of 1998 Section 73(7)
(c) If a person has been sentenced to imprisonment for—10(i) a definite period under section 276(l)(b) of the Criminal Procedure Act;(ii) imprisonment under section 276(l)(i) of the said Act;(iii) a period not exceeding five years as an alternative to a fine,the person shall serve at least a quarter of the effective sentences imposed or the non-parole period, if any, whichever is the longer before being considered for placement under correctional supervision, unless the court has directed otherwise.