Progress bar is designed to show progress, so you have to set the maximum. And tag is the name of a specific timer, you have to start it before using its CurrentTime.
Say you set the Maximum of the progress bar to 10, then do this:
ProgressBar On Created -> ProgressBar Start Timer "MyTimerName" to ProgressBar.Maximum
Every Tick -> ProgressBar set progress to ProgressBar.Timer.CurrentTime("MyTimerName")
Now the progress bar should keep increasing when you run the game, and fulfilled at 10s. Then you can do some actions:
ProgressBar On Timer -> {Any actions you want to do here}