Good morning, Tom.
A couple of things come to mind.
One possibility hinges upon the table being a kitchen table - the sort you put food on. Putting food on the table is a euphemism for earning a living - It may be that you are considering music as a career and believe that you have a good shot at it.
Another possibility comes from the fact that it's your Mom's kitchen table. A mother's kitchen is often a source of comfort. Your guitar resting upon this particular table could mean that your music comforts you in the same way - elicits the same feelings.
Neither possibility excludes the other. And you could take inspiration from this dream to compose a song about this kind of comfort - something tells me that it would work well as a C&W.