With Azure Pipelines you can continuosly build, test and deploy to any cloud platform. Azure Pipelines has multiple options to start based on your project. Even if you are developing a private application, Pipelines offers you 1 Free parallel job with upto 1800 minutes per month and also 1 Free self hosted with unlimited months (as it’s anyway running on your infrastructure).
On the Microsoft-hosted CI/CD with 1800 minutes you might need to find the used/remaining time any time during the month. You can find the remaining minutes from the Azure Devops portal and select the relevant organization.
Organization settings -> Retention and parallel jobs -> Parallel Jobs
Hope that helps you find the remaining free build minutes for your organization!