As a side note, aircraft ascend as they burn off fuel because their engines work more efficiently at higher altitudes (depending on the winds). Higher is better, even for relatively short periods of time.
Yes, it is right there. Drag the bar across the graph and look at the altitude reading on the right hand side. At about 5:10 PM PST it ascends from 37k to 39k ft. and at it doesn’t begin to descend again until about 6:20 PM.