He made his first class debut during the 2012 Vodacom Cup, playing off the bench in the ' 10–55 defeat to in Kimberley. He also made a single appearance during the 2012 Currie Cup First Division, coming on as a late replacement in their 53–33 victory over the in East London and played a further six matches for the sin the 2012 Under-21 Provincial Championship. He made his first start for the Griffons in their opening match of the 2013 Vodacom Cup as they ran out 50–14 winners against the in their first ever match in Polokwane and played his first senior match in Welkom the following week in a 12–26 defeat to, marking the occasion by also scoring his first senior try. He made four more appearances and kicked one conversion as the Griffons finish sixth in the Northern Section of the tournament. His involvement in the 2013 Currie Cup First Division was restricted to a single appearance off the bench in their match against the in Nelspruit. He made one start and one substitute appearance in the 2014 Vodacom Cup as the Griffons matched their 2013 result by finishing sixth, before making three appearances in the 2014 Currie Cup qualification series, a tournament which was introduced to determine the final team to play in the 2014 Currie Cup Premier Division. Herbert scored his first points in the Currie Cup series during this competition, kicking nine points during the season, but the Griffons lost out on a spot in the Premier Division by finishing third to progress to the 2014 Currie Cup First Division. Herbert played in two matches in the First Division, which saw the Griffons finish in second spot on the log. Although he didn't feature in the titleplay-offs, the Griffons won their semi-final 45–43 against the and then win the final 23–21 against the to win their first trophy for six years. He featured in six of the Griffons' matches during the 2015 Vodacom Cup, with his side once again finishing in sixth spot in the Northern Section.
Personal
Herbert is the son of Eric Herbert, who played 205 career matches for the between 1986 and 2001, scoring 2608 points to easily be the highest-scoring player in the history of the union.
