Yes, it is!
Just because a business makes the majority, or all, of its money offline, that doesn’t mean it should be neglecting opportunities for online success.
Whether an offline business builds a website and then pursues general or local SEO goals, SEO represents a huge opportunity for reaching out to a wider audience. More people now use Google than look in traditional directories like the Yellow Pages, and they do so to find offline businesses and locations as much as they do to find ecommerce sites.
If an online platform and SEO activities aren’t part of your offline business plan, you’re missing a trick.