It is possible that your bishop has asked for “the raising of hands”. Some of the U.S. bishops did indeed, and still do, want the “orans” or “modified orans” posture, because they wish to abolish the widespread practice of “hand-holding” at the Our Father.
It is also possible that your priest “read about” this “wonderful” practice in things like Catholic Digest, and thought, “What a terrific idea! I’ll have my flock do this!” Some of the nicest, most devout, most wonderful people do the orans, going back to the 70s when it appeared in a lot of churches overnight. . .of course, at the SAME time period people started making spinach dip again, it seemed, overnight. . .
Until you see it either as a diocesean directive (not just from even your friends or the priest, who has absolutely no authority to alter any part of the Mass, be it posture, word, or otherwise), or part of the GIRM overall, I’d be cautious. The orans posture itself is certainly not bad, it’s a prayerful gesture that goes back many centuries. . .but OTOH, just because a gesture is OLD, or even HOLY, doesn’t mean that it belongs IN THE MASS.