You can and will get an image/photo.
The catch as ever is the expectations. They ALWAYS exceed the equipment and the person.
Planets are liely to be a problem, not many at the present and they are small, very small.
Actually, it's much easier to photograph the classic naked-eye planets than DSOs using a smart phone and a Dob. That's because the planets are typically at least 100 times brighter than even the brightest DSOs, which pretty much eliminates any issues with inadequate exposure times. But yes, the images will appear very small. That's the way they look to your eyes, too.
It is quite easy to photograph the Moon using just about any smart phone/telescope combo, and the results can be shockingly good.