As the clocks at Windsor strike eleven, the coffin of Prince Philip will be taken from the Private Chapel at the Castle to the Inner Hall.
She will be joined by a lady-in-waiting for the short auto journey to the place of worship from the Castle.
The funeral will begin with a procession at 2.40pm which will go through the grounds of Windsor Castle.
Live coverage will be shown on BBC, ITV, and on Yahoo.
Tributes to Prince Philip have poured in from well-wishers around the world, many of whom have remarked on the duke's extraordinary life and his service to the Queen.
They have been planning this day for many years, and despite the significant changes the pandemic has forced on Lord Chamberlain's office, the funeral is as close as they could possibly make it to the Duke of Edinburgh's wishes.
From there, the coffin will travel in "a purpose-built Land Rover - which The Duke was involved in the design of - flanked by military Pall Bearers, in a small Ceremonial Procession from the State Entrance to St George's Chapel, for the service".
The Duke of Edinburgh's funeral procession route
Taking part in the procession in the grounds will bring back some memories of the funeral of Diana, Princess of Wales for William, who was just 15 when he walked behind his mother's coffin through central London after her death in a vehicle crash in 1997. It will be followed by Prince William and Prince Harry, who will not be walking next to each other, but will be split up by their cousin Peter Phillips.
Armed forces bands will play hymns and classical music before the funeral service, which will also be preceded by a UK-wide minute of silence.
Once the service has finished and the royal family has departed the chapel, everything becomes private. Members of the royal family will be in mourning dress and not in military uniform. But Dean of Windsor David Conner will say the country has been enriched by Philip's "unwavering loyalty to our queen, by his service to the nation and the Commonwealth, by his courage, fortitude and faith".
Queen Elizabeth II with Prince Philip in 2002.
Prince Philipp of Hohenlohe-Langenburg, 51, is the grandson of Philip's elder sister Princess Margarita. I think they´re wonderful.
Spouses of Philip's children, along with his grandchildren, the late Princess Margaret's children, and several members of Philip's Greek and German family have also been listed as attendees.
A four-person choir accompanied by the organ will sing pieces selected by the duke, including Benjamin Britten's "Jubilate in C", a piece he commissioned for the St George's Chapel Choir. She gave the boy the middle name Philip in honour of the Duke of Edinburgh. He lived in his wife's shadow, but his death has sparked a reflection about his role, and new appreciation from many in Britain. Yes, he made quite a few gaffes, but it depends which way you took it really.
Jill Lawless reported from London.