How to check connection distributed among RAC Nodes

Below is the queries that can help in identifying the connections that are distributed among RAC nodes.

SELECT inst_id, count(*) "Database Sessions" FROM gv$session
 WHERE type = 'USER' GROUP BY inst_id;

If you need to check the output with the log-in time then you can use below query.

With log-in time (hour):

SELECT inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24') "Connection Time(In Hours)", count(*) "Database Sessions"
  FROM gv$session
 WHERE type = 'USER'
 GROUP BY inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24')
 ORDER BY inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24');