Sorry, I missed your comment. According to Zotero's support documentation (https://www.zotero.org/support/pdf_reader_preview

"These features will all be part of Zotero 6 later this year (2021), but we're making them available as a preview today in the Zotero Beta."

The current version is 5, so of today it is still in beta. But there are only a few months till the end of 2021, so not too long to wait now.

Cyganet wrote:

I'm looking forward to using it once it comes out of beta. I use Zotero
daily and wouldn't want to destabilise my current system. Any idea of a
release date?