Bro. Most of my articles are in indexed in 24 hours but they rank at least after 4-5 days because of heavy competition in my niche. So this does not much affect me if ads are not shown immediately after publishing. It will majorly affect news site who write breaking news articles.
I think google is making too many updates too fast. It is the rule of tech industry that u make some updates, observe the effects, so that if something goes wrong you can rollback the changes. But google is running like a horse gone mad. Making changes everywhere. Typical response of a company in fear.