In a big week for Biden, the push for his $1.9 trillion stimulus plan is on the brink of success

Around the midpoint of his first 100 days in office, President Biden is closing in on his first legislative triumph: congressional approval of his $1.9 trillion coronavirus relief plan.

After the Senate passed the plan on Saturday, it is set to return to the House for final approval as soon as Tuesday. It was also possible that the vote could slip to Wednesday depending on when the House received the sprawling measure from the Senate.

Whether the vote takes place Tuesday or Wednesday, it will still beat the March 14 deadline when unemployment benefits are set to begin lapsing. And it will enable Mr. Biden to take a victory lap on Thursday night when he delivers a prime-time address marking one year since the coronavirus brought much of the nation to a halt.

“The president is taking nothing for granted,” Jen Psaki, the White House press secretary, said on Monday, describing the relief bill as “one of the most consequential and most progressive pieces of legislation in American history.”

The far-reaching legislation would send $1,400 direct payments to Americans, extend a $300-per-week supplemental unemployment benefit until September and provide funding for states, local governments and schools, as well as for coronavirus testing, vaccine distribution and other needs. It also amounts to an ambitious effort to combat poverty, instituting a significant expansion of the child tax credit for one year, among other provisions that would benefit low-income people.