Variant Metafield 2.0 changing with selection

I tried your solution but I get a weird result. Part of the code is shown as text on the product page:

This is the code I was using:

{% for variant in product.variants %}

{% if product.selected_or_first_available_variant.id == variant.id %}

{{ variant.metafields.custom.angezeigte_lieferzeit }}

{% endif %}

{% endfor %}

What am I missing? This is the page I am trying to add it to:

https://studiowohnglueck.de/products/90-wandleuchte?variant=49189101273356