Once the proper beta upadate available from Samsung as per your region. You will receive update notifications.
Reason for Delay - Samsung is providing best software support from last 2 years. They are second in list after google pixel android update policy. So come back to main point the main reason of delay is fixing as many as bugs reported from different regions. So that user experience can be better.
so soon you will received best stable beta update. i hope it will be available before 20th November.
There is no need to worry. Samsung update policy is work in following manners:
High end customer received beta first. For example Samsung most flagship phone received first in our case note 20 then after S 20 comes and after note 10 and then S 10. so they valued their customers what money they are spent on Samsung products.