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There are many other things you could do with Matinee, such as sound effects, events that block the Pushable, speeding it up/slowing it down on hills. This is just covering the very basics.
HUD Progress
I have attached the Kismet for this particular function, as it is a bit abstract. Essentially, it is pulling from the HUD Marker and the Matinee current position to create a progress bar. This text can be copy and pasted right into Kismet.
The HUD Marker it is referencing should look like this in the Actor Properties. f Max Value Progress is the length of your Matinee.
Objective Completion
Nearly identical to all the other examples. Matinee completes, completing the objective with a Complete Objective Event. This then turns off the HUD Marker with a Toggle, and ends the game.