Good question, sony's promoting the black suit quite a bit, of course is a crucial part of the film but well I think lets say the movie will be 2:20 min long i would say from the 1:20 minute mark to the 2:10 mark peter will use the black suit. Aproximately from then on it will be the birth oif venom and the final battle.
I'am thinking that if sandman is the main villain raimi will emphazise more on the sewer/subway battle than on the construction site battle. Raimi has never made the final battle the main event.
In part 1 it was the TS battle that showcased the more spectacle action. In part 2 it was the clock tower/train fight. In part 3 it will either be the sewer fight or the battle royale. But i doubt it will be both. There's always one that's emphazised more if you will.