Obtaining SEO metadata for a specific entry under Sprout SEO 3
I didn't understand Ben's answer, and I just needed to output an entry's SEO meta title with a fallback to the entry title in a for loop. Maybe this will help someone in a similar situation:

{% for entry in entries %}
    {% if entry.sproutSeoElementMetadata.title %}
        {% set title = entry.sproutSeoElementMetadata.title %}
    {% else %}
        {% set title = entry.title %}
    {% endif %}
    &lt;li&gt;&lt;a href="{{ entry.url }}"&gt;{{ title }}&lt;/a&gt;&lt;/li&gt;
{% endfor %}




Just like entry.sproutSeoElementMetadata.title will grab the meta title of that entry, you can do the same with description: entry.sproutSeoElementMetadata.description

The meta image is a bit more complicated though:

{# get meta image's asset id #}
{% set imageId = entry.sproutSeoElementMetadata.ogImage %}

{# get the actual asset image by its id #}
{% set image = craft.assets.id(imageId).first %}

{# output the image's url #}
{{ image.url }}