Most likely it will come next month but keep checking manually and as far as android 15 goes it will be next year the first phones who will get it it will be the new s25 series, then s24 and so on, since there was no public beta for one ui 7 this year and only for developers the stable release of android 15 (one ui 7) will be with new s25 series next year.
My tab s9 ultra is on security patch August. Remember tabs are updated quarterly. While in settings > security and privacy > updates. Make sure Google play system update is on the latest. Sometimes the latest is downloaded with update. Sometimes not. Worth checking, I'm on 1 September for the google update.