The prince is expected to attend the July 1 service in London on what would have been Diana’s 60th birthday.
The statue will be unveiled in the Sunken Garden at Kensington Palace and was commissioned by Prince William and Harry in 2017 to mark the 20th anniversary of her death.
“The princes hope that the statue will help all those who visit Kensington Palace to reflect on their mother’s life and her legacy,” the palace said in a statement at the time.
As per the UK’s COVID restrictions, the Duke of Sussex will have to isolate for 10 days when he flies in from California, the Metro reports.
The US is on the UK’s amber list which means he will also have to test negative to COVID before he departs, and have tests on day two and eight.
According to the publication, he could pay for an extra test on day five which would help him exit quarantine early.
This would push his arrival in the UK back to June 25 at the very latest.
It will be the father of two’s first time back in his home country since Prince Philip’s funeral in April.
Since then, his wife Meghan has given birth to their second child Lilibet and the prince is currently on paternity leave.
According to the Metro, it’s believed Harry will be isolating at Frogmore Cottage in the UK – where due to restrictions he will not be able to see anyone.
Harry and Prince William have reportedly called a truce after recent tension, ahead of the event for their mother.
The publication said the pair will be at the unveiling of the statue together and will stand with each other but give separate speeches.