TextLabel.Text is a property that’s always available. The typewriter function runs asynchronously though so you can’t exactly get the text whilst it’s being written.
I am planning on expanding to a more scripter-friendly version instead of simply newbie-friendly in the future, where more features would definitely be present (Such as #Start, #Pause, #FastForward, #IncrementSpeed, and events such as #Started, #Completed), at which point you would be able to run synchronously and use of TextLabel.Text would get you the current text.