>Plotting the scores the critic assigns for real and fake samples separately? Or do you mean taking mean and standard deviation of the logits for real and fake data and comparing those?

Both ot those work. I like to plot the critic output of real samples into a histogram and then do the same for generated samples. This shows you how well your critic does at separating real from fake samples. You can do this every few epochs during training. You should see that at early epochs those two histograms barely overlap and during the training they will get closer to each other.

It might look like this: https://imgur.com/a/OknV5l0

the left plot is at early training, the right is after some epochs when the critic partially converged. At the end they will overlap almost completely