How to pass progress in RabbitMQ background?

Question

Java

There is a system designed as follows: there is a master and a slave server (Java + Spring). The master distributes tasks among the slaves. The interaction takes place using the RabbitMQ message server. So, what is the best way to organize the transfer of progress (or any other message) from the slave to the master during the execution of the task (without clogging the code)?