The former New Zealand U20 international can play at wing or full-back and his performances have seen him build a reputation as one of the fastest players in New Zealand rugby.
McKay - a former student of Lincoln University in Christchurch - shot to prominence in 2017 as part of the all-conquering New Zealand U20 side that claimed the World Rugby U20 Championship in Georgia.
Part of a back three that included future All Blacks Will Jordan and Caleb Clarke, the speedster crossed for two tries in the tournament, including in the 64-17 demolition of England in the final.
He then made his Super Rugby debut for the Highlanders in May 2018, going on to make 15 appearances for the Dunedin-based side before moving to the Crusaders for the 2021 campaign.
It was in Super Rugby Aotearoa 2020 that the full-back particularly caught the eye in a Highlanders shirt, with one particular highlight reel-worthy defensive play against the Crusaders going viral on social media.
On the Mitre10 Cup stage, too, the former Christchurch Boys' High School student - alma mater of All Black greats Dan Carter, Aaron Mauger and Sir Graham Henry - has excelled; his breakout season in 2017 saw him cross for five tries in 12 appearances for Canterbury, helping his side to defend their Mitre10 Cup crown.
McKay then outdid himself in 2019, scoring an incredible 11 tries in 11 matches for the men in red and black in run of form that had New Zealand pundits raving over his performances.