I have read a book by one of the professors of liturgics at Holy Cross School of Theology, in Brookline, (GOAA), wrote that the custom of kneeling on Sunday during the Consecration of the Gifts, began in Greece, mid-19th century, but it was during the archepiscopal tenure of Archbishop Michael, of Thrice Blessed Memory, (GOAA Archbishop of America, 1949 to 1958, [+/-]), that this practice began in the New World.