Bro, there is no official way to indicate internet speed on the status bar. So, if you are ok with some 3rd party apps,then search the same on the play store like internet speed meter lite and so on..
Actually there is a way of displaying the network speed in the status bar, it is in the "notification - status bar - show network speed" in the settings however I don't know if this would work for you since I'm using an Samsung S8+.
मतलब इस मामले में Samsung का हाथ तंग हैं and they aren't enough capable to provide the same by their own app or in recent updates. I have been writing Samsung since last one year and they are giving assurance to wait for next update.
