Check this AppExchange Dashboard – https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000G0z5fUAB

(Or)

1. Go to Company Information in Setup.

2. Navigate to the “Usage-based Entitlements”. Check the below Entitlements.

a. Maximum Billed Blast Conversations for Messaging
b. Maximum Billed Agent Conversations for Messaging

MaxBilledAgent is the actual conversations.
MaxBilledBlast is the messages triggered by Process Builder or Flow.

For Usage-based Entitlement Fields, check

https://help.salesforce.com/articleView?id=sf.users_usagebased_entitlements_fields.htm&type=5.

Currently, there is a Known Issue with the count.

https://trailblazer.salesforce.com/issues_view?id=a1p4V000001q7iXQAQ