"But now I am pretty freaking stoked aye. I honestly can't believe it. It's been a huge day and I'm still trying to wind down. But man-o-man, this is a dream come true and I cannot wait for the future.
"But, I still have a job to do and that is finish this completion strong."
It's the latest result in what has been an impressive year for Stairmand, who told the Herald last December he would have been happy to just make the New Zealand team for the ISA World Games this year.
He will be one of just 20 surfers in the men's competition at next year's Olympic Games, while Williams will be just one of 20 women to line up.
Williams secured her qualification spot earlier in the week in the women's competition, but will likely have to wait until December before her qualification can become official.
The New Zealand athletes benefit from the quota system put in place for the Olympics, with only two men and two women able to represent each country. Eight women and 10 men qualify by way of the World Surf League Championship Tour, where the Australian quota for the Games will be filled. As a result, the continental spot was left to be fought out between surfers from New Zealand, Fiji, American Samoa and Guam, with Williams outlasting her competitors.
Both Stairmand's and Williams' selections will need to be ratified by the New Zealand Olympic Committee before they are official.
How can New Zealand fill their Tokyo 2020 quota?
Paige Hareb and Ricardo Christie are the best positioned to secure spots in the Olympics Games, with both competing on the CT.
Hareb is one of five surfers competing for four Olympic qualification spots on the CT, with surfers from Australia and the United States accounting for the other four. Hareb's competition for the remaining spots comes from surfers from Brazil, Costa Rica and France.
With more countries represented on the men's tour, there's more competition for the 10 qualification spots. With four events left on the schedule, Christie (31st) needs some big results to get into the Olympic qualification picture, with all 10 spots currently held by surfers ranking in the top 14 on the CT.
In 2020, the ISA World Games serves up the final opportunity for Olympic qualification, with the top four eligible surfers in the men's competition and top six eligible women earning a spot in the exclusive field at Tokyo 2020.