https://wccftech.com/download-watchos-7-gm/

watchOS 7 GM seed is now available for Apple Watch Series 5, Series 4 and Series 3 for download. You can download it for free.

Right on cue, the GM seed of watchOS 7 has been released by Apple. It is the final build that will be released to the end user tomorrow, but currently only accessible by registered developers. There is a possibility that a bug or two is discovered, forcing Apple to release another GM build before pushing the final build out. That is very impossible though, given we have one day to go before the final release.