President Trump will propose major tax cuts and push health-care reform next week in an 11th-hour bid to beef up his first 100-day achievements — while also mocking the significance of the traditional benchmark.

“No matter how much I accomplish during the ridiculous standard of the first 100 days, & it has been a lot (including S.C.), media will kill!” he tweeted Friday morning, referring to the confirmation of his nominee Neil Gorsuch to the Supreme Court.

Ever since Franklin D. Roosevelt, the 100-day milestone has been seen as marker to measure a president’s ability to make good on his campaign promises.

Despite disparaging the looming April 29 deadline, Trump was crowing as recently as last week that he had accomplished more in his first 100 days in office than any other president had.

“I don’t think that there is a presidential period of time in the first 100 days where anyone has done nearly what we’ve been able to do,” he said on Fox Business.

But Trump has not achieved much legislatively, focusing mostly on signing executive orders to roll back Obama-era business regulations and climate policy.

On Friday, he announced that businesses and individuals would receive a “massive tax cut” under a tax-reform package to be unveiled next week.

He promised it would be “bigger I believe than any tax cut ever,” without providing details.

Trump said the package would be released “Wednesday or shortly thereafter” — or just before his 100th day in office on April 29.

Treasury Secretary Steven Mnuchin at first set a goal of getting tax reform through Congress by August, but that deadline has been pushed back.

Mnuchin now says the administration hopes to get a budget bill passed well before the year’s end.

Also next week, the White House and GOP lawmakers plan to introduce a new proposal to replace and repeal ObamaCare.

But Trump conceded it might take a while to get the changes through Congress.

“We’ll see what happens — no particular rush,” Trump said. “Doesn’t matter if it’s next week, next week does not matter.”

Trump also touted “unprecedented action” in his administration as he signed a new executive order at the Treasury Department to dismantle some of the tax and financial regulations of the Obama administration.

“We’ve lifted one terrible regulation after another at a record clip from the energy sector to the auto sector,” Trump said.

“We’re now in the process of rebuilding America, and there’s a new optimism sweeping our country that people have not seen in decades.”

Despite falling short on major campaign promises like replacing the Affordable Care Act and imposing a travel ban on several Muslim-majority nations, Trump has notched some wins.

He got Gorsuch confirmed and pulled the US out of the Trans-Pacific Partnership trade deal.

He also ordered his administration to toughen enforcement of immigration laws and has sought to fulfill a major campaign pledge by authorizing construction of a wall along the US-Mexico border.

Congressional and FBI investigations into Russian interference in the election and Trump’s possible ties to Moscow still cast a cloud over his administration.

Team Trump has strongly denied any collusion with strongman Vladimir Putin’s regime.