You can view your remaining posts to publish within the app.
1. Select a published post.
2. View your publish settings in the bottom right corner.
3. You will see the plan you are on the number of remaining posts.
The user above has made 1 post and has the remaining amount of 'unlimited'. If you have made 4 posts and you are on a plan with 10 active posts it will show 4/10 active posts.