Speaking from scaffolding at the top of the newly-rebuilt spire, Mr Macron said the fire-ravaged landmark would be completed on schedule.
The wooden spire crashed spectacularly through the cathedral's centuries-old roof in the fire that ripped through the cathedral on April 15, 2019.
“Deadlines will be met. It is a formidable image of hope and of a France that has rebuilt itself," Mr Macron said.
This is an important and emotional moment," he added as he spoke with restoration workers on the scaffolding.
The 315-foot spire was not part of the original design of the cathedral which was built over nearly 200 years starting in the middle of the 12th century.
It was added during a 19th century restoration by architect Eugene Viollet-le-Duc.
After the devastating 2019 fire, the spire has been reconstructed in identical fashion, despite initial debate about whether to give it a modern twist.
Mr Macron also announced a contest for artists to design six new stained-glass windows, and the creation of a Notre Dame museum.
Notre Dame is set to reopen for religious services and to the public on December 8, 2024.
Some 500 workers are present on the site every day, racing to rebuild the cathedral, which has dominated the Ile de la Cite island in the River Seine since the Middle Ages.
The spire's cross was mounted on Wednesday, and the rooster at the top will also soon be added.
From early 2024, workers will start waterproofing the oak roof with lead.
Over the course of next year, the cathedral's furnishings, statues and artwork will be brought back in, as well as the organ, which had been taken out completely for renovation.