Yes that's a pretty well known scripture. However, what does it mean? Have you ever compared various tranlations of this passage? Other renderings include the kingdom of God "is in your midst" (NIV), "is already among you" (NLT), "is in the midst of you" (ESV).
Christ, as God's anointed king, was already taking the first steps of establishing God's kingdom. People did not need to go looking for it because it was unfolding right in front of them. In fact, they were talking to it's king.
There was one variant of Christianity, perhaps the Jewish one that Matthew is written BY, who thought the virtuous would inherit the Earth, and the kingdom would come in their generation. However, this evades working out whether they believed in personal resurrection into some kind of environment.
 And saying, Repent ye: for the kingdom of heaven is at hand.
 From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.
 And as ye go, preach, saying, The kingdom of heaven is at hand.
 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least
in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great
in the kingdom of heaven.
The idea being referred to in Matt 5:5 may be the defunct idea that the Kingdom would start immediately, using ALIVE population, and being a meritocracy.
But there does seem to be a resurrection as well:
 Therefore in the resurrection whose wife shall she be of the seven? for they all had her.
 Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God.
 For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven.
The meek may inherit the Earth for a time, until some other Christian cult deems appropriate, and then the resurrection happens,...