The Albury-born swimmer helped the women's 4x100m freestyle relay to a world record win at the Toyko Olympics on Sunday.

Stamps picturing the four swimmers - Harris, Emma McKeon and sisters Bronte and Cate Campbell - will be available in participating Australia Post retail outlets from Wednesday, July 28, while stocks last.

"These Games are unlike any other in history, and we're proud to be able to recognise our Olympians in this way and help Australians celebrate these remarkable athletes who are representing their country and performing at their peak," Australia Post executive general manager community and consumer Nicole Sheffield said.

Australia Post plans to celebrate each Australian gold medal performance in Tokyo with a gold medallist stamp, which will be produced within 72 hours of the medal ceremony taking place

Relay heat swimmers Madison Wilson and Mollie O'Callaghan are acknowledged on the stamp sheetlet.

SUNDAY: Albury-born Meg Harris produced the swim of her life on Sunday to help secure Australia's first gold medal of the Olympic Games.

The 19-year-old, who grew up on the Border, was part of the Aussie team which smashed the world record in the 4x100m freestyle relay in Tokyo.

Meg, the daughter of former Albury Tigers and North Melbourne player Darren Harris, swam the second leg of the final.

Bronte Campbell handed over to her with Australia second but Harris dragged them into the lead and it only got better from there.

Emma McKeon extended their advantage over the rest of the field before Cate Campbell surged clear to touch the wall in an astonishing time of 3:29.78.

Meg's grandparents, Wayne and Maureen Harris, cheered her on from their home in Adelaide.

"It's amazing," Wayne said. "We don't realise the level of it just yet but her whole life has changed.

"We've seen her swim since she was a nine-year-old and to see her now, 10 years later, competing at this level, it's just phenomenal."

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Wayne and Maureen lived in Howlong until two years ago and have followed Meg's swimming journey closely. She got into the sport when her family relocated to Mackay and has taken things to another level since moving to Brisbane.

Harris, making her Olympic debut in Tokyo, won 50m freestyle gold at the Youth Commonwealth Games in 2017 and claimed silver with the 4x100m relay team at the Junior World Championships two years later.

"People don't know, outside of the family, how much work that kid's put in to be a swimmer," Wayne said.

"It's the time, the effort, the strain, the pain, everything.

"She's had it all and her parents have supported her all the way through.

"It's been very tough for her but I've always said to her that for every bit of hard work, you get some result.

"There are sacrifices because your social life just about doesn't exist.

"It's swimming every morning, every afternoon, she's in the gym when she's not swimming and there are dieticians telling her what to eat and when to eat.

"They have the psychology tests, massages three or four times a week and it's just non-stop.

"But she is just fabulous. She was a little Albury girl to start with and now look at her.

"I keep saying to her 'enjoy it for as long as you can.'"

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