After more than 14,000km and six months on the road, marathon runner Pat Farmer's trek for the Indigenous voice has reached its finish line at Uluru.

The former Liberal MP choked back tears as he described the run's final stages in reaching the spiritual heart of the country.

Mr Farmer had been running more than a marathon a day since April in support of the voice, going across the country to spread the message about the constitutional change ahead of Saturday's referendum.

"When I first got my glimpse of Uluru, it looked an almost purplish colour from a distance, it brought a tear to my eye and a realisation that this journey was finally coming to an end," he told reporters at Uluru.

"This monument behind me, this monolith behind me, has been a magnet to my soul."

The runner urged people to vote 'yes' at Saturday's poll to enshrine the Indigenous advisory body in the constitution.

"All we have to do is vote 'yes', and we can change history in this country for the better for future generations, for our children, and for all children in this nation," he said.

"On Saturday, we have an opportunity to learn from the mistakes of the past, to correct those mistakes and to move forward together as one."

Mr Farmer was met at Uluru by Prime Minister Anthony Albanese, who was also present at the start of the run in Hobart.

"At that time, (we) thought it was pretty ambitious someone running 14,500 kilometres. He has provided an inspiration for Australians," Mr Albanese said.

"We'll be a little bit greater if we wake up on Sunday having recognised the first Australians and having said that we want to listen to them about matters that affect them."

I keep hearing 'you have lost this, you may as well lay down and die'.

I don't believe that.

I believe Australians will look at this on the day and say, 'well this is a decent, honourable, good thing for us to do.'

— Patrick Dodson (@SenatorDodson) October 9, 2023

As the voice campaign enters its final days, the 'yes' campaign is hoping for a last-minute boost from the father of reconciliation Patrick Dodson, who will give an address to the National Press Club.

Polls have shown the referendum will fail but with one-in-eight voters still undecided, supporters are hoping Senator Dodson will bring a final push for constitutional change.

A group of Australian of the Year winners have also united to urge the country towards a 'yes' vote.

Adam Goodes, Evonne Goolagong Cawley, Dylan Alcott, Cathy Freeman, Grace Tame, John Farnham, current winner Taryn Brumfitt and others have signed an open letter backing the referendum.

More than three million people have cast early votes ahead of polling day on Saturday.

NT senator and 'no' campaigner Jacinta Nampijinpa Price said there was much work to do to close the gap, regardless of the result of the referendum.

"It's been acknowledged it's not working. We want to fix the systems that are currently in place within our democracy, to ensure that they do work," she told Nine's Today program.

"I want to move away from the welfare issue and allow people to be empowered through being employers and job creators."

'No' campaigner Warren Mundine rejected suggestions reconciliation with Indigenous Australians would not be possible should the referendum fail.

"Australia has been moving along (for) reconciliation for 20, 30 years at least," he told ABC Radio.

"This is one thing that has come out which is positive ... 'yes' and 'no' people want things to be reconciled."