(CNN) Treasury Secretary Steven Mnuchin said Sunday that lawmakers have a "fundamental understanding" that a deal has been reached to pass a massive stimulus bill to a staggering economy reeling from the coronavirus as soon as Monday.

"I do think it will get done. We've been working around the clock in the Senate with Republicans and Democrats. I've been speaking to (Senate Majority Leader) Mitch McConnell, (Senate Minority Leader) Chuck Schumer, the (House) Speaker and I think we have a fundamental understanding and we look forward to wrapping it up today," said Mnuchin, in an appearance on "Fox News Sunday."

Mnuchin explained that the bill, which could cost trillions, has several components: small business retention loans, which will give small business two weeks of cash flow to retain their employees and keep up with overhead; direct deposits, which would be approximately $3,000 for the average family of four; enhanced unemployment insurance, which was a sticking point in the talks; and a "significant package" of $4 trillion in liquidity, working with the Fed, to support the economy and broad-based lending programs.

Mnuchin said the bill is structured based on a 10-to-12 week scenario, and that if in 10 weeks coronavirus is still ravaging the country, the administration would return to Congress to ask for more.

Bipartisan groups of senators worked late into Friday night with top officials from President Donald Trump's administration to lock in a final agreement -- a deal that people directly involved in the negotiations tell CNN could top a cost of $1.5 trillion -- before falling short of a midnight deadline imposed by McConnell.

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