"I finally feel, like, good," the No. 14 pick in June's draft told ESPN's Chris Forsberg on Sunday.
"I don't have a date but I'm hoping to be back for the beginning of the year. Gotta heal up, but I feel great."
Porter underwent a second back operation in July, eight months after a microdiscectomy derailed his lone college season at Missouri. As a result of playing just three games for the Tigers, his draft stock dropped substantially.
The Nuggets didn't provide a timetable for Porter's recovery after the July procedure.
"I'm able to get on the court a little bit right now, do some different things," he said. "But my rehab has definitely been very conservative. They're really taking it easy with me, being patient with me."