From a reader:
I have a question that I haven’t been able to find an answer to. During Benediction of the Blessed Sacrament, when the priest traces the sign of the cross with the monstrance, should the members of the congregation simultaneously make the sign of the cross? Is this a matter of local custom, or is it governed by rubrics? Our university parish has Exposition and Benediction twice a week, and the congregation makes the sign of the cross, which always feels awkward to me, since the priest moves the monstrance so slowly. However, whenever I see Benediction on EWTN, no one in the congregation moves.
You are blessed to have Exposition and Benediction at your university.
You haven’t found an answer because there isn’t one.
There is no "standard" way by which people should cross themselves at Benediction.
As a matter of fact, while it is entirely natural to do so, it is not obligatory to cross yourself at all.
This is one of those moments in which you are free to do as you please, as the spirit moves you. You can do so together with the actions of the one giving Benediction, or before or after or during, or not at all.