Asked a service representative

[Anthonygarcia13]

I was notified buy a service representative from samsung. That it could take up to 24 to 48 hours for the BETA to come though just be patient. 

[KE3JU]

I got mine 5 minutes after signing up yesterday. It surprised me.

[USBetaModerator3]

Hello,
Thank you for your participation in beta program.

One UI 8 Beta for Watch LTE series with T-Mobile carrier is currently eligible for software update.

Being said, we apologize for the inconvenience to those who were able to join Beta (Because the Watch model is eligible) yet could not receive the software update (due to ineligible network conditions).

We have shared your feedback to the relevant team for further improvement in beta participating process.

Regards,

One UI Beta Team