https://travel-europe.europa.eu/etias/about-etias/what-is-etias
The official EU website still says planning to start in the last quarter of this year.
It’s already June and no word, so I’m thinking that either this is going to be delayed even longer, or it will be suddenly implemented with short notice.
I’ve just booked flights to Europe for Sept-Oct. so keeping an eye out for a start date.