Hubble's best images are arguably the Ultra deep field images. Linked below. This is the best pictures we have of what the deepest and oldest parts of space look like. But even with Hubble they took monochome images at 4 separate near IR wave lengths then did a false color composite for the final image.
The Ultra Deep Field image was taken by a sensor calibrated to between 1.0 to 1.6 µm wave lengths of light. So actually very near infra red. Definitely not in visible color spectrum like we would see with our eyes, but still relatively close to what our eye could normally see as "red".
The JWST is calibrated to 0.6–28.5 µm which is basically the very edge of visible light red into the far Infra Red. But not only that, the mirrors that they used plated with gold are poor at reflecting visible light. They are engineered specifically to reflect in the IR range.
Anyway long story short we probably either get some kind of composite false color images on Tuesday. Or just plain monochrome is possible too if they just want to highlight a specific spectrum.
Hubble Ultra Deep Field final image.