Oracle announced the following

19c Long Term Release Patching End Date will be

• December 31, 2029 with Premier Support
• December 31, 2032 with ES/ULA

Notes:

• Premier Support (PS) ends December 31, 2029. Extended Support (ES) will be Jan 01, 2030 through December 31, 2032
• Error Correction / Patching is available through December 31, 2032 with paid ES. Without paid ES, patching is only available until December 31, 2029

You can see the detailed note from Oracle here.