As Laurent_R points out, this can be much more simply done in Perl. Taking your raw output as my input, I grep any lines of interest then pass them through a map. Split breaks each line up and I pull out the 9th element (subscript 8 as subscripts are zero-based) from the map and print it.
$ perl -Mstrict -Mwarnings -E '
open my $ntpqFH, q{<}, \ <<EOD or die $!;
remote refid st t when poll reach delay offset
+ disp
======================================================================
+========
LOCAL(0) LOCAL(0) 10 l 34 64 377 0.00 0.000
+ 10.01
*gpstime.domain.l .PPS. 1 u 879 1024 377 1.85 -0.02
+5 0.03
hitman.domain.lo 0.0.0.0 16 - - 1024 0 0.00 0.00
+0 16000.0
EOD
my @asteriskLines = grep m{^\*}, <$ntpqFH>;
say for map { ( split )[ 8 ] } @asteriskLines;'
-0.025
$
I hope this is of interest.
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