Looking at Debian’s release-critical bugs, you can see that Trixie is close:
Testing now has fewer critical bugs than Stable, and the number is dropping quickly.
About 200 bugs still need to be fixed to get the number down to where the previous releases were done.
Maybe you can help? Bugs blocking the next release can be as simple as missing translations for the upgrade instructions.
Unless you change your sources.list, you’ll just update your current system.
unless they have
stableinstead ofbookwormon theirsources.listIt defaults to the codename. Any installer you download will be either Bookworm or Sid right now.