Alright, since it's Superman. So I think it's fair to just scale Goku to his highest logically, The dragon ball universe has multiple realms. One of these realms is the living world which is it's own space time and likely infinite.

There are like 7 or so realms like the living world, this alone scales Goku to low multiversal. Now the afterlife is said to transcend dimensions and it's not perceived by the living world and it higher then heaven (a realm like the living world).

This should scale the afterlife to a bare minimum 5D, which should make the macrocosm atleast 5D. Ssg Goku was gonna destroy it, so he is also 5D. Goku when from a solar system or galaxy level to 5D with one transformation, so it's kinda clear SSG is atleast a infinite multiplier. Almost forgot, the macrocosm is infinite or should be.

The dragon Ball world has 12 macrocosms, which are all the same. So the multiverse holds the entirely of these 12 mfs, also it's been stated by space between universes called the neutral zone. Which contains the 12 universes, so the multiverse scales above all that making it atleast 6D.

Now to the biggest mf of them all, the timeline. These monsters contain the entire multiverse in them and then some, these guy should atleast scale to 7D due to hold the entire dbs multiverse. Why is this important? Goku never did anything like that, right?

Infinite Zamasu (the one that became the sky) was stated to be one with the timeline and we even see go to different timelines, this means he scales to it too. Goku and Vegeta were blocking attacks from and Goku even states he could do something if he had a senzu but he didn't so he just called zeno.

Zeno appears and deletes Zamasu. Later on Jiren while like suppressed as fuck was stated to be the strongest opponent they had ever faced, which will include Infinite Zamasu. I think Goku should scale to 7D