Do a search on http://perlmonks.org for "download progress" and you will find some nice examples of using gtk, and tk. Also check out cpan, in the Tk modules, for Tk::ProgressBar and Tk::ProgressIndicator. Here is a simple snippet for one. Just figure out a way to count your received bytes and put it in the Repeater sub.

#!/usr/bin/perl
use Tk;
use Tk::ProgressIndicator;

my $l_MainWindow = MainWindow->new();
my $l_ProgressIndicator = $l_MainWindow->ProgressIndicator
   (
    '-current' => 0,
    '-limit' => 200,
    '-increment' => 10,
    '-height' => 20,
    '-width' => 400
   );

$l_AfterID = $l_MainWindow->repeat (500, sub {Repeater();});
$l_Counter = 0;
$l_ProgressIndicator->pack();
Tk::MainLoop();
################################################### 
sub Repeater
   {
    $l_ProgressIndicator->configure ('-current' => $l_Counter);

    if (($l_Counter += 10) > 200)
       {
        $l_MainWindow->afterCancel ($l_AfterID);
       }
   }
#####################################################
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