Royal commentator Victoria Arbiter told Canadian TV station CTV that "all eyeballs" will be on the commonwealth service on March 9. Although Prince Harry and Meghan Markle have individual engagements prior to March 9, the commonwealth service will be the first time all Royal Family members will attend an event following the Duke and Duchess of Sussex return to the UK.
Ms Arbiter said: "Harry is already in the UK, he appeared in Edinburgh yesterday.
"He was there to launch another section of Travalyst which is a new travel intuitive based on sustainable travel.
"We are expecting the Duchess of Sussex to arrive in the UK in the coming days.
"She and Harry have a number of engagements together, they will be at the endeavour funds awards on March 5th.
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The Royal Family will have their game faces on for the public reunion
Meghan Markle and Prince Harry stepped down as senior figures of the Royal Family in January 2020
"Meghan has an engagement on behalf of international women’s day on March 8."
She continued: "The couple will appear at the commonwealth service on March 9.
"It’ll be the first time we have seen them with Royal Family members in attendance as well.
"So of course all eyeballs are going to be on there.
"I expect the Royal Family to have game faces on.
"It is going to be business as usual."
Earlier this month a Royal expert told Sky News that Prince Harry has become "very isolated" following the Duke and Duchess of Sussex's decision to step down as senior figures from the Royal Family.
Robert Jobson, the Royal Editor of the London Evening Standard, stated that Prince Harry will be feeling similar to how Meghan Markle felt in the UK.
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The Royal Family tree
The royal expert outlined that the Duke of Sussex's family is on the "other side of the world" and that Meghan and Harry's situations have "completely reversed" in the last two months.
Mr Jobson said: "Harry is very isolated now and that is the danger.
"Where she was saying she felt isolated in the UK and that she didn't feel there was any support, her family was on the other side of the world.
"What’s been happening here is now the situation has been completely reversed."