INSIDE TD GARDEN'S home locker room, Boston Celtics forward Jayson Tatum was asked about the frustrations he experienced during his nearly 300-day journey back from a torn Achilles. "I ain't know how this s--- was going to be," Tatum told reporters Sunday after Boston's loss to the Minnesota Timberwolves . "It's tough. In the moment, you try not to think about it. You just want to be Jayson Tatum and feel like yourself again. "I'm not Superman, so it's obviously going to take some time." After missing the first 62 games, Tatum returned March 6 to a standing ovation from the Boston crowd. And at times, including during that season debut against the Dallas Mavericks that featured 15 points and 12 rebounds in 27 minutes, Tatum has shown flashes of the All-NBA game that has made the 28-year-old wing one of the league's top 10 players . Tatum has scored in double figures in all eight games he has played -- he reached at least 20 points in five of them -- with four double-doubles.…