The Galaxy Tab S8 family update comes with the latest November 2023 security patch on board and if you are located in Europe, you may want to check for the OTA update manually via the Settings menu.
As for the Galaxy A73, the handset is seemingly receiving One UI 6.0 along with the same November 2023 security patch. The update weighs about 3GB and is also sighted in Europe.
In case you are outside of Europe and you are not receiving the latest firmware, be patient, as Samsung likes to roll out its updates gradually. It should arrive in a matter of days.