It is on the website, I just checked. (It's under the processing tab, subheading "Interview")
Considering the 1st was a Wednesday, this is almost the farthest away a 3rd Monday can get. But also they did extend their deadline due to technical issues for a few days, so I am currently thinking of the 20th as a soft deadline. I am also assuming none/not many have gone out yet, as JHU is a very popular program and there is bound to be some GradCafe users in the mix.
So maybe they will release over the weekend, or all on Monday, or sometime next week. I am keeping my hopes up, and wish you all the best of luck!