I have entered string entries in my IO calculation tags.
I want to show the indicator as a green label when the written value from the VTScada to RTU gets written successfully.

As shown in the pic above, When this string value gets written successfully into the RTU from SCADA, I want to show the indicator as Green.

How can I do that? Please guide me.
Let me know if any other way also has to do so.

I'd probably use a tag that can read/write data and link it to the entry box and another that will only read data from the address which isn't linked to anything. Then create an IO tag in digital calc mode tag to compare the two.

[tag1] == [tag2] ? 1 : 0

Link the output of that to your inidicator.