It's not official yet but Charlotte has a night game so it doesn't need to be announced until the afternoon. They announced Vaughn so early because the Dash are playing in 5 minutes
Andrew Vaughn is at DH and batting 3rd in 30 minutes for the Dash
https://www.mlb.com/whitesox/prospects/stats/affiliates?date=07/31/2019
https://www.milb.com/scores/whitesox/2019-07-31
The bold is what intrigues me. SSS obviously but no matter how good the results have appeared at AAA, they have always come with a ridiculously high walk rate. Hopefully the trend continues.