Using an audio clip to control the Timeline

I have a composition which has two peices of VO. Each has an associated text block.

I want to play the first VO when the first text is clicked. Then, when the VO ends, I want the first text block to fade out, the second to fade in and play the second VO when tapped.

I have the timeline set up with labels to play through the transitions at the end of the first VO. No issues there.

I have the audio playing when I click on the text blocks. All good.

However, I do not know how to make the timeline wait for the audio clip to end before playing.

This is the code for the first text block:

sym.$("RUP01_Nar_1")[0].play();

sym.play('Nar2');

This plays the audio but also plays the timeline instantly (so the text blocks fade from one to the other as soon as the audio starts).

I figure I need some sort of code in between which says, essentially, 'wait until the audio finishes then [play timeline]'. But as much i have searched I cannot find anything to do that.

Thanks for your help...