The brothers, with the King, will follow the coffin in a procession through central London.
It comes after Prince William and Prince Harry, accompanied by their wives, appeared in front of crowds gathered outside Windsor Castle on Saturday.
It was the first time the brothers had been seen alongside one another in public since the funeral of their grandfather, the Duke of Edinburgh, in April last year. In a tribute to the Queen released on Monday, Harry also said he wanted to "honour my father in his new role as King Charles III". He told BBC Radio 4's Today programme: "It's a very sad duty, but it's a unique privilege to take part in the armed forces' last duty to our Queen.
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