When I Google “midterm election results”, the Associated Press tells me it’s 48-48. Can someone help me understand why this article is saying that the democrats

When I Google “midterm election results”, the Associated Press tells me it’s 48-48. Can someone help me understand why this article is saying that the democrats have 50/51? Is it just assuming that the races that haven’t concluded are so heavily leaning democrat that they will finish in that direction?