Give category a timecode meta

I’m currently creating a site for my student radio station and I need to find a way to add a day & time as meta to each programme category so that it’ll be possible to:

1) Order categories by the day & time.
2) Display the day & time by recalling the meta.
3) Use a function to recognise which programme is currently on air and display all the data attached to it.

An example of my current category loop is such (using category description as a way to add an image):

<?php
$args=array(
  'orderby' => 'name',
  'order' => 'ASC'
  );
$categories=get_categories('child_of=4');
  foreach($categories as $category) {
    echo '
      <div class="showboxtitle" style="background:url('. $category->description . ') no-repeat;">
      <a href="' . get_category_link( $category->term_id ) . '" class="nct" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a>
      </div>';
} ?>

I’ve checked out the category meta plugin and tried to use the get_terms_meta, but I can’t seem to get even basic text meta to work, let alone specific timecode meta.

Any help or pointers would be fantastic!

Cheers in advance,

Will