Exposition and Benediction of the Blessed Sacrament are liturgically correct after Mass. Mass ends with the Prayer after Communion. There is no blessing or dismissal. The exposition host is then placed on the altar in the monstrance. Ideally there should be additional candles although the requirement for a minimum of twelve no longer applies.
At my Church we normally have Exposition after weekday Mass. On Corpus Christi and the Feast of Christ the King, we have a Blessed Sacrament Procession and Benediction at the end of Mass.
The priest from a nearby Anglican Church recently transferred to the Catholic Church, along with a number of his congregation under the Ordinariate dispensation. He temporarily joined our parish staff during his Catholic diaconate and following his ordination until an Ordinariate church became available. He was due to celebrate Mass on one of the days when we have a Blessed Sacrament Procession and Benediction so I produced for him full service notes with the traditional hymns and chants. This seems to have been reproduced and become the definitive work on the subject among the Ordinariate - without ever having been subject to an Imprimatur and Nihil Obstat.
When the Sacred Congregation for the Liturgy find out, I’m not sure whether I’ll be burnt at the stake by our Diocesan Archbishop or by the Ordinariate.