Paul is on his way. He is going to get to them. The churches where he has been preaching have taken an offering for those in Jerusalem. Paul is taking the money to Jerusalem, and then he will head their way. He asks for their prayers as he goes to Jerusalem. He looks forward to being with them in joy as they refresh each other.
Paul knows that going to Jerusalem is dangerous for him. And, in truth, he is arrested in Jerusalem. A long saga begins and eventually ends with Paul being taken to Rome. You can read about it in Acts chapters 21 – 28.