The report by Whitehall official Sue Gray into claims of parties at Downing Street during lockdown could be handed to Number 10 today - and published soon after - according to reports.
BBC political editor Laura Kuenssberg told BBC Radio 4's Today the handing over of the so-called 'party-gate' report could happen later.
The Mirror reports it is also set to finally be published today, but with key parts left out.
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Prime Minister Boris Johnson is expected to give a statement to Parliament after 3.30pm shortly after the long-awaited inquiry is made public.
The report will be stripped of key details after the Met Police launched an investigation into around eight of the lockdown gatherings, and asked Ms Gray to make only 'minimal reference' to them in her report, according to the Mirror.
Ms Gray had still not sent her report to Downing Street as of 10am today, it is understood. There is still a slim chance it could be delayed again.
Earlier this week Metropolitan Police Commissioner Dame Cressida Dick confirmed officers were investigating 'potential breaches of Covid-19 regulations' at events held at Downing Street and in Whitehall in 2020, reports Wales Online.
But as a result of the police investigation, Ms Gray's report is likely to be redacted in part.
Kuenssberg told the programme: "I'm told this morning the Sue Gray report could come today, but then again, it might not.
"We should have some clarity on that a bit later on."
And the political editor later tweeted: "There have been a lot of last minute changes in this whole process so it’s subject to moving around again but, as things stand it does seem like the report will go to Number 10 later this morning."
Asked on BBC Breakfast, meanwhile, whether the inquiry into alleged lockdown-busting parties in Downing Street could be 'imminent', Simon Clarke, the chief secretary to the Treasury, said: "I believe it will be soon.
"The precise timing of all of this is a matter for Sue Gray.
"It is a completely independent process and I do not know precisely when she will bring that report forward."
The Metropolitan Police has asked Ms Gray, a senior civil servant, to make only 'minimal reference' to No 10 events which are subject to a criminal investigation.
Questions have been looming over the future of the PM Boris Johnson's premiership as he awaits the findings of the Whitehall and police inquiries into claims of lockdown-busting gatherings.
No 10 had still not received a copy of the highly anticipated Sue Gray report on Sunday evening.
Mr Johnson, meanwhile, said today he 'sticks absolutely' to what he's said in the past about the alleged lockdown-breaking parties in Downing Street.
On a visit to the port in Tilbury, Essex, the Prime Minister refused to be drawn when asked whether the imminent report by Ms Gray into the gatherings would be a 'whitewash' after the Met's request for redactions.
The PM added: "Of course I stick absolutely to what I've said in the past."
