They went to Jerusalem to wait for it....What do you believe happened the day He breathed on the disciples, and told them "receive the Holy Spirit." ? I can assure you they did receive Him, and u hey were born again. That founded the church. His corporate Body.
Acts 1:4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.
5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence....
8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth....
Future tense.