Hey Oscar,
While it's not an event, we do have a way of getting this information in each SDK. For Android, the ad is actually playing in your video player, so you can just grab the current time of the video as you need it.
For iOS, the IMAAdsManager object has an
adPlaybackInfo property which returns an instance of IMAdPlaybackInfo. That object has a property
currentMediaTime, which will tell you the current time of the ad.
If you have any more questions, let us know!
Thanks,
Shawn Busolits
IMA SDK Team