Wiktionary
by now
adv. At some time in the near past
Wikipedia
By Now
"By Now" is a song written by Dean Dillon, Don Pfrimmer and Charles Quillen, and recorded by American country music artist Steve Wariner. It was released in April 1981 as the second single from the album Steve Wariner. The song reached number 6 on the Billboard Hot Country Singles & Tracks chart.
Usage examples of "by now".
He is not paying much attention to Baseball Hattie by now, except to give her a slight pasting now and then, but Hattie is so happy about the baby that she does not mind these pastings.