.NET Core 3.0.0 Preview 7 is available for download and development. This release includes .NET Core 3.0.0 Preview 7 and .NET Core SDK 3.0.100 Preview 7. The previous version NET Core 3.0.0 Preview 6 was released on June 12, 2019. To run .NET Core 3.0 Preview 7 requires Visual Studio 2019 16.3 Preview 1, this will be released shortly.
Microsoft announced full support for the current released .NET Core version and given a go for production note for developers. They also recommend developers to test the existing application on preview 7 before deploying this to production.
The new update features major improvement like reduced SDK Size and with bugs fixes