Hi, does anybody know, when a Update for RAW of Nikon D850 is coming?

Hello, robo33a!

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RAW Support updates are now released as part of the system updates. If the Nikon D850 will be supported at all, you will probably see it as part of the next High Sierra update.

Since you are asking in the Aperture forum - be not disappointed, if Aperture cannot use the RAW Support for this camera, once it will be released with an update to High Sierra. As other users reported, none of the RAW Support released by Apple since OS X El Capitan v10.11can be used in Aperture. You will have to use a different application to develope the RAW files and convert them to a format, that Aperture can process. The RAW Support for Aperture is stuck on the RAW Support released with Yosemite: https://www.apple.com/aperture/specs/raw.html