Joh, who has now hosted seven Olympic Games for the network, said Tokyo was "on par" with her favourite ever.
"I loved every second of it," she said, before heaping praise on her co-host Luke Darcy.
"Luke was just the best person to share the duties with… prepared, fun, passionate and with so much integrity," she wrote on Instagram.
"A huge thank you to all our commentators who did such a wonderful job bringing the pictures to life and capturing the emotion so well."
"Thank you to everyone who watched and Let’s do it all again from August 24 when the Paralympics begin," the 47-year-old continued.
Joh also gave a shoutout to Australia's "amazingly talented, composed, articulate" athletes, who took home a total of 17 gold, seven silver and 22 bronze medals.
"Thank you for what you have given us over these last few weeks. You’ve been just incredible," she said.
It was a no-brainer that the former professional swimmer was asked to join Channel Seven's Olympics coverage given she represented Australia in the pool at the Commonwealth Games in 1990.
“I never take the job for granted and I am so proud of that milestone,” the mother-of-two told New Idea last month.
“Every Olympics is always different and there’s always something different I love about them, but this one is going to be one that we are talking about for the ages.”
Despite her many years of experience on the job, Joh admits she still expects the unexpected when it comes to hosting the Olympics.
“You never know what they will throw up. You have to be ready for everything. But that’s the thrill of it … that’s what makes hosting it so exciting!” she said.