This begins the count toward the Feast of Weeks, שבועות. Shavuot. Shavuot marks the beginning of the latter fruits, the wheat harvest. For Messianic fulfillment,
40 of these 50 days, Yeshua was with his talmidim in Jerusalem. (see Acts 1)
On the 50th day, the Holy Spirit was given. This day, called "Pentecost" in the Greek, is also the Biblical Holiday: Shavuot ("weeks"). (see Leviticus 23:15-16 and Acts 2)
In fact, it was because of this Festival and the requirement to be in Jerusalem, that there were so many Jews there to witness the giving of the Holy Spirit. B"H
I found this Messianic Devotional to use during the counting of the Omer, which starts today. Here is a link for it:
Have a blessed counting!