They looked at it in ’67: how to receive Communion. The Consilium says it’s pretty much up to the pastor: kneeling or standing, but pick one for the sign of family unity:
34. a. In accordance with the custom of the Church, the faithful may receive communion either kneeling or standing. One or the other practice is to be chosen according to the norms laid down by the conference of bishops and in view of the various circumstances, above all the arrangement of the churches and the number of the communicants. The faithful should willingly follow the manner of reception indicated by the pastors so that communion may truly be a sign of familial union among those who share in the same table of the Lord.
When they receive communion standing, it is strongly recommended that, approaching in line, they make a sign of reverence before receiving the sacrament. This should be done at a designated moment and place, so as not to interfere with the coming and going of the other communicants.
And even back in ’67, a gesture of reverence before receiving, not after, was indicated. I see a variety of practices, including people who will bow before receiving, then sign themselves as they look at the cross afterward. Little familial unity there.