Following the results from the Puerto Rico primary Sunday night, the Democratic frontrunner had 2,358 delegates -- including super-delegate -- at this hour, according to a count by ABC News -- putting her just 25 delegates shy of the 2,383 needed to become her party’s presumptive nominee.
Clinton is expected to officially clinch the nomination on Tuesday when voters go to the polls in California, New Jersey, Montana, North Dakota, South Dakota and New Mexico.
In the build up to Tuesday, Clinton has recently made a point of acknowledging the historic nature of her candidacy as she campaigns across the country.
"Starting next Tuesday, we’re on our way to breaking the highest and hardest glass ceiling," Clinton said at a rally in Culver City last week.
And during campaign event in Fresno on Saturday, she pointed to it while laying out her qualifications to be commander-in-chief.
"Now look," she said. "I know we’ve never done this before. We've never had a woman president."
Clinton will celebrate Tuesday's primaries in her home state of New York with a campaign event at the Brooklyn Navy Yard, not far from where her campaign is headquartered.
Tuesday also marks exactly eight years to the date from when Clinton dropped out of the primary race against then-Senator Barack Obama in 2008.
"Although we weren't able to shatter that highest, hardest glass ceiling this time," she said during her concession remarks on June 7, 2008, "Thanks to you, it has about 18 million cracks in it and the light is shining through like never before."