Google Merchant Center Next now allows you to connect your Google Business Profile. To accomplish this, navigate to Google Merchant Center Next, select ‘Business Info,’ followed by ‘Shops.’
It’s important to note a current limitation: although super admin privileges are required for adding or editing your connection or details.

The latest version of Google Merchant Center offers enhanced capabilities compared to its classic counterpart. Notably, users have flexibility in editing business information and photos.
Data exchange is another key feature, with data sharing established between the two platforms. For Google Merchant Center, this means sharing the account name, account ID, and product details for use in Google Search and Maps. Conversely, Google Business Profile will share store-specific data, including the name, address, and performance metrics.
If you are struggling with a super admin privilege issue. Then this refers to Google Business Profile, which Ads Liaison explained. This means linking and unlinking accounts must be done within Google Business Profile and not Google Merchant Center.
But what are the benefits for client?
Assuming the word client, refers to the consumer. This is unclear, as currently not data is yet used in listings. As Google indicates what data is shared, I would assume they are preparing for something.