psql: print values and return the COUNT(*) value to bash?

Currently I do this in a bash script:
Tbl=table_1
Fld=field_1
Sql="SELECT CURRENT_TIMESTAMP - MIN($Fld) AS days_ago
          , MIN($Fld) as oldest_date
          , COUNT(*) AS cnt
     FROM $Tbl;"
psql -h <host> <db> -Xc "${Sql}"
 days_ago | oldest_date | cnt
----------+-------------+-----
          |             |   0
(1 row)

More stuff happens after this.  I want to print out these four lines, but
also test the COUNT(*) value and bypass other bash commands if the count ==
0.

Is there any relatively simple way to do this (psql print and return
count(*))?

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