There are currently installers for Acrobat and Acrobat Reader 64-bit. They can be accessed via https://helpx.adobe.com/acrobat/kb/download-64-bit-installer.html. Note that this not general availability and may not support languages other than English in terms of UI.
Also, this is absolutely not an updater. If you want to install th 64-bit versions, you currently must totally uninstall any 32-bit version. Then you can install the 64-bit version.
Note also that any third party plug-ins (such as PitStop, Quite Imposing, etc.) must be re-installed with 64-bit versions of those plug-ins. Not all plug-in makers have updated their plug-ins to have 64-bit versions.
Finally, be aware that contrary to popular mythology, the 64-bit versions of applications (not just Adobe applications) generally don't provide any higher performance than the 32-bit versions, but rather, provide access to larger memory spaces supporting much larger and more complex documents.