Pressing isn't just about running hard and fast. Positioning and timing is just as important, if not more so.
Over the last 12 months:
Neves
Presses - 20.23 per 90 minutes (71st percentile for midfielders in Europe).
McTominay
Presses - 14.34 per 90 minutes (12th percentile for midfielders in Europe).
Fred
Presses - 24.75 per 90 minutes (93rd percentile for midfielders in Europe).
Neves also has a higher success rate with 31.33% successful presses, compared to Fred (29.5%) and McTominay (28.5%). To put that in context, the average seems to be about 30%.
Once again this really does highlight how little McTominay presses compared to most midfielders, despite the general belief that he is hard working. Even after improving a little since Rangnick took over (up to about 16.5) he's still comfortably below average.