Option 1: Using the Microsoft OneDrive client in Windows 10
1. Right Click on OneDrive Client > Click Settings
2. Click Account Tab
> Below, you can find the storage account status
Option 2: Using the Microsoft OneDrive Cloud
1. Login to your OneDrive cloud account: https://onedrive.live.com/about/en-us/signin/
> On the lower Left side, you can immediately see the storage status
2. Click Settings > Options
3. On the Manage storage Tab
> You can find the Storage Summary including Your current plan(s)
Related Topic:
How to Enable Microsoft OneDrive, please refer to this Guide