Nurses at Montefiore and Mount Sinai have reached tentative contract agreements with the hospital systems, their union said Monday, marking a breakthrough in the largest nurses strike in New York City history.

The agreements, reached late Sunday into early Monday, could bring approximately 10,500 nurses back to work this week, if ratified, the New York State Nurses Association said.

Nurses at Montefiore, Mount Sinai Hospital, Mount Sinai Morningside and Mount Sinai West are scheduled to vote on the deals from Monday through Wednesday, the union said.

If approved, they are expected to return to work on Saturday, Feb. 14. A spokesperson for Montefiore confirmed that the two sides have reached a tentative agreement.

The union said about 4,200 nurses at NewYork-Presbyterian are still on strike, with safe staffing standards remaining the key sticking point in those talks.

NewYork-Presbyterian, for its part, said it has accepted a “comprehensive proposal” that mediators presented to both sides early Sunday morning. 

“NewYork-Presbyterian accepted the proposal which includes the same wage increases for all three hospitals, as well as preserves the pension, maintains our nurses’ health benefits, and includes increased staffing levels,” the hospital system said Monday. “We look forward to bringing our nurses back to care for our patients."

NYSNA said the tentative agreements include enforceable safe staffing standards, salary increases of more than 12% over the life of the three-year contracts, protections against workplace violence and protections for health care benefits, which it said hospitals “threatened to drastically cut.”

“For four weeks, nearly 15,000 NYSNA members held the line in the cold and in the snow for safe patient care,” NYSNA president Nancy Hagans said in a statement.

“Now, nurses at Montefiore and Mount Sinai systems are heading back to the bedside with our heads held high after winning fair tentative contracts that maintain enforceable safe staffing ratios, improve protections from workplace violence, and maintain health benefits with no additional out-of-pocket costs for frontline nurses,” Hagans added.

Nurses began bargaining late last year before walking off the job Jan. 12. The strike has stretched into its fifth week.

During that time, hospitals have remained open, relying on the help of thousands of temporary travel nurses hired before the strike.