CXone Reporting API: Filtering agent state history for last 24 hours

Quick question about querying CXone Reporting API (v2) for agent state history. I need to filter the results strictly to the last 24 hours using the $filter parameter.

Here is my current request structure:

GET /api/v2/analytics/reporting/agents
?$filter=startTime ge 2023-10-25T00:00:00Z

The endpoint returns 400 Bad Request with invalid filter expression. How do I correctly format the time range for this OData query?