Matthews skated for about 30 minutes, according to Elliotte Friedman, which indicates that he could be returning sooner than many fans expected him to.
Given the Leafs' schedule next week, and the fact Matthews is skating again, the most likely return date would be Thursday. If the Leafs use the same strategy they used when he returned at the end of November, allowing him to get a couple of full practices in before returning to the lineup will be the game plan.