Physicians performed a pulmonary lobectomy Friday in New York City to remove the growths, which were found during a previous hospitalization in November.
Court spokeswoman Kathy Arberg said Ginsburg, 85, worked from her hospital bed over the weekend and has been moving around since the surgery.
Ginsburg cast the deciding vote Friday against the Trump administration's enforcing a ban on asylum for migrants who illegally cross the U.S.-Mexico border.
The operation last week marks Ginsburg's third cancer fight. She previously overcame colon and pancreatic cancer, and had a heart stent procedure in 2014.
It wasn't immediately clear whether Ginsburg's latest cancer bout is a recurrence of her pancreatic cancer or a primary lung tumor.
Ginsburg, despite the health issues, has never missed oral arguments. The Supreme Court is scheduled to meet again Jan. 7.