Assuming you're intending "real" to mean the technical definition of "real" which is "adjusted for inflation", its basically been flat since 2019*, and that's using the government's inflation measures which abuse things like basket substitution and other hacks to hide the actual increases in the true cost of living. If you made better assumptions about inflation, you actually would see that median real income is down dramatically already over the past several decades.
Here is a recent video on some of these measurement biases: https://www.youtube.com/watch?v=0B4tgG-CGXU&t=1s
