i have got a doubt DisplayTech 204B LCD Module Initialization Process Please Explain or Tips?

I checked the Displaytech web site for 204B and downloaded the controller data sheet for the ST7066U controller.  I looks a bit updated and it now it shows delays between each step.

I expect you could also check the BF (busy flag) as it says this becomes functional after sending that first highlighted command.

Here is the link to the ST7066U controller.