Blocked on android phone, will my messages ever be read?
It would entirely depend on the device, the SMS app, and its settings. For example, on Microsoft's SMS organizer app that I use, blocked SMS are stored for days before they are deleted.
The same is the case for most devices. Just like they will try to notify the user that a blocked number tried to call them, some apps may show a notification that a blocked number tried to text them. The others would keep the message and not notify. The remaining few would drop the message and neither save it, nor notify.

TL;DR: It will depend on the device and the SMS app used. You cannot do anything anymore. So, just hope that they never get to see it and move on.