Massachusetts opened up eligibility for my age group two days ago.
According to https://www.mass.gov/doc/weekly-covid-19-vaccination-report-february-18-2021/download about 1.2 million people here have been vaccinated, but only around 4% have had the second dose.
The new eligibility introduces another million people.
So a million need the second shot and another million need two shots, making roughly three million shots needed.