2 Corinthians 1:1 Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, To the church of God that is at Corinth, with all the saints who are in the whole of Achaia:
Ephesians 1:1-2 Paul, an apostle of Christ Jesus by the will of God, To the saints who are in Ephesus, and are faithful in Christ Jesus: 2 Grace to you and peace from God our Father and the Lord Jesus Christ.
Philippians 1:1-2 Paul and Timothy, servants of Christ Jesus, To all the saints in Christ Jesus who are at Philippi, with the overseers and deacons: 2 Grace to you and peace from God our Father and the Lord Jesus Christ.
Colossians 1:1-2 Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, 2 To the saints and faithful brothers in Christ at Colossae: Grace to you and peace from God our Father.
Acts 9:32 Now as Peter went here and there among them all, he came down also to the saints who lived at Lydda.
Acts 26:10 And I (Paul) did so in Jerusalem. I not only locked up many of the saints in prison after receiving authority from the chief priests, but when they were put to death I cast my vote against them.
RC doctrine does not restrict believers to being saints to Heaven, though her certified saints are there, but the texts you and i provided, and there are more, show the title "saint" is used for believers in general.