Thanks for your reply Pugs1957. I read somewhere on the Internet that the tab s 8.4 was receiving an update, I can't remember where I read it but I believe it was going to be this year 2021. What type of update I don't remember.
I have just found the following that is on the internet -
firmware version T700XXU1CTK1 for the device Samsung Galaxy Tab S 8.4 (WiFi), model SM-T700