Following Friday's 19th stage, the longest of the race at 222.5km, yellow jersey leader Froome admitted that with only Saturday's race against the clock and Sunday's procession to Paris left, he should wrap up a fourth overall victory.
Froome has a 23-second lead over Romain Bardet, and 29 seconds over third-placed Rigoberto Uran.
"It was so close coming in this time trial", said Froome.
And Froome, 32, can celebrate on today's processional ride into Paris having increased his lead to 54sec - his biggest margin of the three weeks.
The time trial in Marseille was the penultimate stage of the Tour and Froome finished third, after which British fans called for him to be knighted.
"I've spoken to my wife, she's headed off to Paris with my son".
"So they're all special in their own ways and this year I think will be remembered for being the closest and most hard-fought battle between the general classification rivals".
"We did this morning a video of the roundabouts and we knew you had to be on the right side and everyone went on the left side except Nikias and me", Boasson Hagen said.
'There will always be resentment of success from some quarters, I guess, but Team Sky and all of the other teams are treated equitably and fairly and if there was any reason to doubt anyone's integrity then those processes would come into play. There was no change in the general classification.
Froome now needs only one more title to match the Tour record of five shared by Frenchmen Jacques Anquetil and Bernard Hinault, Belgian Eddie Merckx and Spaniard Miguel Indurain.
Born in Kenya to English parents, who ran a crop farm, Froome started cycling seriously when he 13 years old. But he denied Spaniard Mikel Landa - Froome's teammate - a podium spot by just one second.
"It's a huge honour just to be mentioned in the same sentence as the greats of Tour de France history", Froome said.
Twice a runner-up at the Giro d'Italia, Uran added another second-place finish at a Grand Tour to his resume but his hopes were nearly ruined when he hit barriers as he entered the Velodrome, which hosted the start and finish of Stage 20.
Froome has remained conservative in the saddle, but his experience of the latter stages of grand tours has once again delivered him the position he craves.
So why didn't Boasson Hagen wait for the sprint from the nine riders - a sprint he would have been the favourite to win?
"It was a good opportunity for us GC guys who have had a tough time in the Alps to regain a bit energy and sit on the wheels ahead of tomorrow's time trial".
Although Froome was booed at the start of the time trial yesterday in Marseille, and also got a hostile reception when he almost caught up with his main French rival Bardet at the finish line in the stadium, he has always remained gracious.