Time-dependent actions are executed at a specific time, such as 10 days before a record's close date. When that specific time passes, the workflow rule re-evaluates the record to make sure that it still meets the rule criteria. If the record does, the workflow rule executes those actions.
Demo about Time-Based Workflow using Workflow Rules, Scheduled Action using Process Builder, Schedule Flow using Lightning Flow - Salesforce Process Automation Tools. Watch the video to learn!