USB boot on Pi4, works or not?

    Hi,

    I have latest RPi4 and msata SSD connected over USB3 port, with latest firmware:

    Code
    # rpi-eeprom-update
BCM2711 detected
Dedicated VL805 EEPROM detected
BOOTLOADER: up-to-date
CURRENT: Thu  3 Sep 12:11:43 UTC 2020 (1599135103)
 LATEST: Thu 16 Apr 17:11:26 UTC 2020 (1587057086)
 FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: up-to-date
CURRENT: 000138a1
 LATEST: 000137ad

    I wen through the Pi4 USB Boot is coming soon!!!! YAAAY but I am a bit lost. Is it supported out of the box or not? What should I do to make it working because at the moment I can hear some sounds in the TV but there is a blank/black screen.