Toppi later published the historical thesis entitled "Maria Lorenza Longo e l'Opera del Divino Amore a Napoli"; he was also a writer.
[1] Toppi collaborated with Catholic Action in Benevento and with the Secular Franciscan Order in Naples and he served on the Diocesan Pastoral Council of the Nola diocese from 1984 until 1989.
Pope John Paul II appointed Toppi on 13 October 1990 as the Bishop-Prelate of Pompei while elevating him as an archbishop (the holder of the said office was a bishop in rank).
Cardinal Michele Giordano conferred episcopal consecration upon Toppi on the following 7 December in the Santuario della Beata Vergine del Rosario di Pompei.
On 15 April 2013 the bishops from the Campania region approved the proposal to request and launch the beatification cause for Toppi and this decision was communicated one month later.
issued the official edict of "nihil obstat" (nothing against the cause) which approved the cause's introduction and titled Toppi as a Servant of God.
Pope Francis named Toppi as Venerable on 20 January 2022 after he determined that the late bishop had lived a life of heroic virtue.