1. Navigate to Google's Business Profile Verification Status checker tool here.
Select the "Yes" radio button and click Continue
2. If the business that you are looking for shows up, then you're done! The Google account you're currently signed into is the one that manages your Google Business Profile. You can confirm what the account details are by clicking on the user icon in the top right corner of the screen.
If not, then keep reading below...
3. If no business is found, then your business profile is managed by a different Google account.
To see whether one of your Google accounts is associated with your business profile, click on the user icon in the top right corner of the screen and select a different Google account to check.
If you are not currently signed in to any other Google accounts, you will have to login by clicking "Add another account."
Keep testing different Google accounts until you find the one associated with your business. The follow this guide to make updates to your Google Business Profile.