bash-3.00# hares -display -group testdg |grep Crit
testdg  Critical              global         1

So, it would be:

hares -display -group |grep Critical

The following output shows which resources are set to Critical:
app1          Critical              global     1 ctgnic        Critical              global     1 oracledata1   Critical              global     1 oracledata2   Critical              global     1 oracledata20  Critical              global     1 oracledata21  Critical              global     1 oracledata22  Critical              global     1 oracledata23  Critical              global     1 oracledata24  Critical              global     1 oracledata25  Critical              global     1 oracledata26  Critical              global     1 oracledata27  Critical              global     1 oracledata28  Critical              global     1 oracledata29  Critical              global     1 oracledata3   Critical              global     1 oracledata4   Critical              global     1 oracledata5   Critical              global     1 oracledata6   Critical              global     1 oracledata80  Critical              global     1 tmpdatadg     Critical              global     1 tmpdatadg2    Critical              global     1 tmpocrdg      Critical              global     1