How to preserve a spread in a jar

If you're working with something acidic like a jam, you can indeed process the jars in hot water. This is sufficient to kill any pathogens that got sealed in with the product and can thrive in an acidic, high-sugar environment like jam. Since the water bath also seals the jar, nothing can enter the sealed jars, the jam is now shelf-stable. In your case, the spread is unlikely to be acidic enough that water bath canning is sufficient to preserve it.

You should look into pressure canning instead. You would need a pressure cooker for this, which will let you process the jars at a higher temperature than a water bath allows. There's also some concern around the fat in your spread (I assume it's based on something like coconut oil?). Fat can interfere with the seal and prevent the jars from sealing properly, and it can also go rancid even if the jars sealed correctly.

You would need to reach out to the food safety agency in your country to see what requirements they have on similar products, and likely have a food safety lab test your sealed product to determine that it's safe for as long as whatever your best-before date says.