While I long for a 3rd person mod like many others, I'm afraid that it is little more than wishful thinking at the moment.
Last time I followed modders working at a 3rd person mod, they were trying to alter the camera position with cheat engine. Besides that they still had to work around headless V (which is used for 1st person view) by enabling the head with console commands. I've read that the console commands would be removed with update 1.05. I haven't checked myself, but is this is true, the modders have to look for another solution for headless V.
Then there's still the matter of animations. If you (probably) saw the youtube video of cineagle, you'll see that animations aren't fit for a 3rd person view: extreme wide shoulders, hunchback,.... And this is for walking, running and jumping alone.
If they want to alter those animations, then the 3D model, or at least the skeleton for the animations, needs to be imported into 3D editing software. Later it has to be exported back into the game without any flaws.
In some games, like the resident evil franchise, modders succeed without the need of support from the developers. But most games would need support from the developers of the game in the form of extensive modding tools like the creation kit for The Elder Scrolls and Fallout series.
I think until CD Projekt Red releases any form of modding support, it will be hard as a rock to release a decent 3rd person mod. Even then I think we have to satisfy ourself with a 3rd person mod for only walking or roaming around between missions, as those are the least complex to alter. Maybe this changes when animations for a multiplayers are made, who knows?
I also saw someone mentioning unequiped guns or rifles hanging at V's back or something similar. In Skyrim they've created such a mod called Armed to the Teeth. Even the developer's support a script extender with (of course) extra scripting had to be created to make such a mod possible. If Cyberpunk 2077 receives a toolkit similar to that of The Witcher 3, then very dedicated and talented modders are needed for this to happen. How they would do it is beyond me. My modding knowledge and experience limits itself to rextexturing, a bit meshmodding and tinkering with the hex editor.
For me walking and roaming around in 3rd person in a primary first person game is enough, just like I would in games like Skyrim and Fallout. Like someone else mentioned earlier to me in this topic: To give me a nice vibe now and then to see my "barbie doll" walking around, before going back in action.