When someone blocks your number then does imessage show “delivered” sign?

Let me make this very clear here, the "delivered" and "Read <time>" signs will not appear if your number is blocked by the recipient.

BUT BUT BUT...

Not getting "delivered" and "Read <time>" is not an indication that the recipient has blocked your number. There are other circumstances when you will not receive those signs. Some of them are...

At the recipient's end...

1. Phone not in the network coverage area
2. WiFi is not connected to the Internet - ISP (Internet Service Provider)
3. Data plan exhausted / not enabled
4. The device is switched off.
5. The Phone number is changed
6. The device is in Airplane Mode.
7. iMessage is deactivated.
8. The phone number is de-registered from iMessage
9. Travelling abroad

Other causes are...

• iMessage services are down at Apple Inc's end --> Apple - Support - System Status
• You have chosen a wrong phone number / Apple ID

When you’re blocked the message won’t even get to change from blue to green - it’ll just stay blue with no “delivered” or “read” message underneath it. When it changes to green, it's mean that a) you have “Send as SMS" turned on, and b) either you or the recipient has no data connection. iMessage requires data to be sent and received.