In terms of chapters, you'd be on chapter 13 out of 17. If I were to guess, I'd say you have about 5-7 hours remaining.
I have a lot of side content left to do. I had only beat one berserker but have since beaten 2 more bringing my total to 3 out of 12. I did most side quests as they popped up. There was one or two that I came across in Vanaheim that was stomping me but that was mostly due to a damn dragon interfering with a boss fight. I have to figure out how to kill him first before trying that one again.
As far as gear and armor, I leveled my weapons to level 7 for axe and blades, level 6 for spear. I have the dragon scale armor and it is level 6 or 7. I actually got a trophy for crafting the armor which surprised me because I did not use any guides as it was my first playthrough.
Now that I've beaten the game, I did go and look at some stuff for the platinum trophy. You definitely need to get to level 8 minimum before you can have a chance at the level 9 post game boss(es). I don't intend to lower the difficulty, so we'll see how it goes