The CPS has already begun reviewing some of the evidence.
Garry Moncrieff, from the Metropolitan Police, said the final number of people and organisations being considered for charge was “not expected to vary a lot” when the full submissions were made in September.
He said officers had gathered extensive material over several years as part of the inquiry.
“We have gathered strong evidence,” Moncrieff told reporters at a Scotland Yard briefing.
He added: “It is important that we do it once and do it right.”
The Met Police chose to wait for the findings of the Grenfell Tower fire public inquiry before looking into the potential for criminal charges.
The inquiry began in 2017 and was concluded in 2024. Moncrieff said this had added time to the investigation but had not damaged it.
