This is the source for the graphic above which says Israel has a confirmed number of 18 million doses purchased.

Although they, according to this, aim to purchase more in the near future:

“There are plans for a very large additional purchase spanning tens of millions of vaccine doses,” said Katz.

Thus far, close to four million Israelis have received at least one dose of the coronavirus vaccine, according to data released by the Ministry of Health Tuesday morning.

More than half of those, or roughly 2.3 million people, have received both the first and second dose of the vaccine.