It appears Marcus Morris’ debut for the Celtics will be when they host the San Antonio Spurs on Oct. 30. The 6-foot-9 forward confirmed to reporters on Monday that, for now, that’s the target date. Morris spent time after practice playing some one-one-one against rookie Jayson Tatum. “I’m trying to push on it a little more,” he said. “Felt pretty good beating the rook’s ass one-on-one.” The addition of Morris to the lineup can’t come soon enough for the Celtics (1-2). They have already lost Gordon Hayward (ankle) for the season, and Marcus Smart (ankle) missed Friday’s win over Philadelphia. Smart said he would probably be in uniform for Tuesday’s game against the New York Knicks. Those injuries have forced the Celtics to dig deeper into their roster, resulting in several first-year players seeing action. Having a veteran like Morris on the floor would bode well for the Celts in their quest to remain among the better teams in the East this season.