GOV. CHARLIE BAKER said the federal government will ship 10 million doses of the Johnson & Johnson vaccine to states next week, with more than 100,000 doses slated for Massachusetts.

After weeks of production delays, Johnson & Johnson may finally be starting to deliver on promises it made in its contract with the federal government. That contract said 2 million doses would be delivered by February 1, 10 million by March 1, and 25 million by April 1. Deliveries haven’t come anywhere near that level, so the 10 million coming next week represents catchup.

“We have heard many times ‘that it’s coming, that it’s coming.’ This is a big sign that things are actually starting to get here,” the governor said at a press conference in Quincy. “That’s a big deal.”

The Johnson & Johnson vaccine is administered with a single shot, while the Pfizer and Moderna vaccines require two shots.  The one-shot advantage means more people can be fully vaccinated quickly and its use also expands the capacity to deliver more shots to more people. The Johnson & Johnson vaccine is also much easier to handle – no subzero temperature storage, for example, which allows mobile delivery of vaccines.

So far, Massachusetts has received about 100,000 doses of the Johnson & Johnson vaccine, which won emergency use authorization from the Food and Drug Administration on February 27.

Baker said 5 million doses will be released to pharmacies participating in the federal government’s distribution program next week and 5 million will go to states.