Can I use
?

Server Timing

- WD

Mechanism for web developers to annotate network requests with server timing information.

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 85: Supported
  3. 86: Supported

Firefox

  1. 2 - 60: Not supported
  2. 61 - 80: Supported
  3. 81: Supported
  4. 82 - 83: Supported

Chrome

  1. 4 - 59: Not supported
  2. 60 - 63: Disabled by default
  3. 64: Disabled by default
  4. 65 - 85: Supported
  5. 86: Supported
  6. 87 - 89: Supported

Safari

  1. 3.1 - 12: Not supported
  2. 12.1 - 13.1: Partial support
  3. 14: Partial support
  4. TP: Partial support

Opera

  1. 9 - 51: Not supported
  2. 52 - 70: Supported
  3. 71: Supported

iOS Safari

  1. 3.2 - 13.7: Not supported
  2. 14: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Not supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Not supported

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 11.2: Not supported
  2. 12.0: Not supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Demo
Blog post
MDN article on PerformanceServerTiming