Here are a few screenshots of using the Real Time SQL Monitor in SQL Developer 20.2 against a 19c database. I use the MONITOR hint explicitly in the SQL statements to force them to be visible in the SQL Monitor.
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Note : The "B" after the "18" and "20" for I/O requests in the first two screenshots is *not* "Billion"
This is an INSERT statement
This shows the Execution Plan of the INSERT statement
Here is more complicated query with Parallel Execution (all 3 panes : Plan Statistics, Plan and Parallel Execution)