Thats incorrect you can’t
Everyones stream delay is different based on their ISP, what platform they are on, what country they live in, what quality they are on and what computer they are on.
What you can get from the API is the broadcast delay. The broadcaster can delay their whole stream (before Twitch pumps it out) by a number of seconds.
Which can also be done in the streaming software, and if it is, we have no idea.
In summary, no you can’t get the viewers delay. It’s not stored or collected and it varies.