Hello, my name is Anis. I'll be glad to help you today.
I absolutely understand the situation and how you must be feeling right now.
I will be straightforward, Windows Update cannot be blocked from the PC due to security and legal requirements that Microsoft needs to comply.
However, I can help you manage Windows Updates, so that it does not interfere during your work.
Please perform the following steps.
Go to Settings App > Windows Update
You can pause updates for up to 5 weeks and allow it at your convenient time.
Then, click on Advanced Options.
Click on Active Hours. Click on the drop down and select Manually.
Choose an active hour which beyond your regular work timings.