From Pentecost to the removal of Christs body…..
angels ministry are very limited in scope, the Church administering Truth:
They are NOT visible during Church Age

Colossians 2:18-19
18   Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind,
19   And not holding the Head, from which all the body by joints and bands having nourishment ministered, and knit together, increaseth with the increase of God.

But in the days AFTER the church is gone?
And after the 144,000 are gone?
Revelation 14:6-7
6   And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,
7   Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.