Single Select

{% if product.metafields.custom_fields["availability"] != blank and 
product.metafields.custom_fields["availability"] != 'Not applicable' %}

  {% assign availability = product.metafields.custom_fields["availability"] %}
  {% case availability %}
    {% when '2 weeks' %}
      {% assign message = 'This product usually ships in 2 weeks.' %}
    {% when 'Immediately' %}
      {% assign message = 'This product usually ships right away.' %}
  {% endcase %}

  <div class="custom-field custom-field__availability custom-field__type--text-list">
    <strong class="custom-field--title">Availability</strong>
    <div class="custom-field--value">
      {{ message }}
    </div>
  </div>
{% endif %}