The tricky part will be the the train tunnel on the other end of Fehmarn, the current best guess for the finishing date is 2032[1]. They haven't started building yet[2], so I wouldn't put a lot of trust in that number.

[1]: https://de.wikipedia.org/wiki/Fehmarnsundtunnel [2]: https://www.anbindung-fbq.de/streckenabschnitte/sundquerung....