Is 'Delay until UTC time' implemented in PX4?

PX4 Autopilot
1

I am having no success trying to delay the next navigation command until a UTC time with MAV_CMD_NAV_DELAY (93). Is it supported in PX4?

A hold delay for a specified number of seconds works as expected.

I am using QGroundControl v4.1.1
I am flying Holybro QAV250s with PixHawk 4 Mini (PX4 firmware 1.11.3)

The PX4 documentation here
indicates that that command is implemented.

Examining the flight plan generated by QGroundControl shows this command:
{
“autoContinue”: true,
“command”: 93,
“doJumpId”: 2,
“frame”: 2,
“params”: [
-1,
23,
30,
30,
0,
0,
0
],
“type”: “SimpleItem”
},

A similar post from Feb '19 seems to indicate the command should work.

Thanks!