Here's a source from Bosch themselves saying "up to 65 nm", which I assume means 65 nm as the smallest feature. They're making "Application-specific integrated circuits (ASICs), and power semiconductors" mainly for the automotive industry, so they're probably counting on that being enough. And what a great time to start production.

https://www.bosch-presse.de/pressportal/de/en/300-mm-wafer-f...