How to check for a custom field?

I am new to wordpress, so I have the following question, regarding if this is the right way to do this. It seems to work in my context, but I am curious, if there are better ways to do this?

I am using wordpress as a cms and have a section of portfolio pages. Some of them have urls to projects and some don’t have that. So I have the following to check if that custom field is there:

if ( get_post_meta($post->ID, 'project_url', true) != "" ) {
	// Add link here
};

Is this how I would do this?

Thanks a lot for any advice on this!