When you want to use in record home pages, app pages etc, you need to use in
Lightning App Builder. You can configure meta file
Action overrides are not yet available. You can refer to this document reguarly to check what all features are available at any point of time.
Supported Salesforce Experiences and Tools
Lightning web components are supported in many Salesforce experiences and tools. To use a Lightning web component with an unsupported experience or tool, wrap it in an Aura component.
These Salesforce experiences and tools are supported.
Lightning App Builder
Lightning Components for Visualforce
Lightning Out (beta)
First-Generation Managed Packages
Second-Generation Managed Packages
Tooling API—LightningComponentBundle, LightningComponentResource
Embedded Service Chat
Gmail and Outlook integration
Unsupported Experiences and Tools
Lightning Web Components doesn’t currently support these Salesforce experiences and tools. To use a Lightning web component with these experiences and tools, wrap the component in an Aura component.
Salesforce Console (Navigation Item API, Workspace API, UtilityBar API)
URL Addressable Tabs
Conversation Toolkit API, Omni Toolkit API, Quick Action API
Standard Action Overrides, Custom Actions, Global Actions, List View
Actions, Related List View Actions