According to this article
in The Hill
(03/04/21), all the Democrats have to do is wait out a Republican temper-tantrum aka Filibuster, then The Dems can vote the measure along party lines if no Republicans vote for the measure as well.
An actual filibuster will ensue and will go on; possibly for a month or two. All filibusters in history have ended sometime — the longest filibuster lasted 60 days when the 1964 Civil Rights bill was held up. Sooner or later, all filibusters will fizzle and a simple majority (51 percent) can then pass the legislation.
If this is true, then somebody ought to tell the Senate Dems and get going on getting ol' Joe's agenda passed.