Jesus said because He was going to the Father we would be able to do “greater works” (John 14:12). How is it possible to do greater works than those of Jesus?

Greater works are possible because the Spirit of God is now always present. Jesus said it was good that He went away so that He would send the Spirit to His followers. Unlike Jesus in bodily form, the Spirit can now be with each of us personally, at all times.
Greater works are possible because the Son of God is now always praying. Jesus, now at this very moment, is seated at the Father’s right-hand where He ever lives to make intercession for us. He is our Advocate!

Because of the eternal ministry of the Son and the Spirit we can do works greater than even those accomplished by Jesus when He walked the earth.