ChatGPT has the following answer:
The Dell UltraSharp U2723QE monitor has a colour depth of 8 bits per colour channel. This means that it can display a total of 16.7 million colours (2^8 = 256 colour values per channel, i.e. 256 x 256 x 256 = 16.7 million colours).

The colour depth cannot be found in the technical specifications, but the monitor covers the colour spaces very well:
100% Rec 709, 100% sRGB, 98% DCI-P3
Incidentally, this is no longer a current model. The successor is the U2725QE.