In the app, the only way you can see the max speed of a track that has already been uploaded is to replay it and go to the end.
Could you not add it to the Track Details page – there’s quite a lot of space between the title and the data (e.g. between “DURATION” and the time in hours and “DISTANCE” and the distance travelled in nm.
In the replay I can see the max speed for the leg while it’s playing – but my offwind legs don’t seem to be detected in the race on the link below when compared to Orca. I can see from the track that I did 14.0 knots (@57.50 min) but the replay only gives a max speed of 9.92 knots when you click on the VS.