The Gallery is a good way of checking your progress and how much there is left, it's not exact but it helps with keeping track of stuff, you can access it at the top left of the screen, the 2 Hearts.
Just keep playing through the game, you'll know when you reach the end of an update not cause of a notification saying you reached the end for the current update, but because Caribdis will smack you on the face with lore then a cliffhanger that will leave you hype for the next update. At least that's how I felt every time I reach the end of each update. xD