CJ McCollum has imagined what his first NBA game will be like. After 2½ long months of rehab from the foot injury that delayed that start of his pro career, his debut is closer than ever. “I’ve thought about it for a long time,” the Trail Blazers rookie guard said. “We’re pretty deep into the season now, so all the games feel the same. It’ll be a little different when I play, but I think I’ll be ready.” The Blazers still don’t have a specific timeline for when McCollum could play in a game, and he is not expected to be activated for the team’s game against New Orleans at the Moda Center on Saturday. But he took a major step forward Friday when he participated in a full practice for the first time since fracturing his left foot during practice on Oct. 5. “It’s good to be out there and kind of feel like a player again,” McCollum said. McCollum had a CT scan on the foot on Dec. 11, and two days later, after doctors evaluated it, he was cleared for three-on-three scrimmages, which typically are halfcourt. He took part in those during the Blazers’ four-game road trip, going to the arenas early with the Blazers’ other reserves to get the work in. He ramped up to a four-on-four, fullcourt scrimmage in Minnesota on Wednesday, then took part in a full practice Friday, which included full-blown five-on-five scrimmaging.