The CDC’s independent panel of vaccine scientists unanimously endorsed Pfizer and Moderna’s boosters for all adults, one of the final regulatory steps before the U.S. can officially start distributing the doses.

The Advisory Committee on Immunization Practices voted to recommend the shots. The Food and Drug Administration authorized both company’s vaccine boosters for everyone 18 and over earlier on Friday, and CDC Director Rochelle Walensky is expected to clear the doses soon after.

The panel’s recommendation opens up eligibility to everyone 18 and over in the U.S., but the group more strongly endorsed shots for older Americans by saying everyone 50 and over should get a booster. It previously said people over 65 and some other high-risk people should get a third shot.

Once Walensky signs off, tens of millions of Americans who’ve received their two initial shots at least six months ago will be eligible to get a third shot as soon as early as this weekend.