The Catechism in Questions & Answers

194. What did Jesus mean when He said: “I will come again”?

Jesus told His disciples: “And if I go and prepare a place for you, I will come again and receive you to Myself; that where I am, there you may be also” (John 14: 3). Jesus Christ will come again—this time as the bridegroom.
When He returns as the bridegroom, He will take unto Himself those of the dead and the living who have received the gift of the Holy Spirit and have allowed themselves to be prepared for this event. The return of Christ is near.

Future hope: see Questions 549. et seq.