... applying : 3 / 0 (92.86%) ...
In the above example, the applier is processing seqno 3 / fragno 0 and already applied 92.86% (this represents a percentage of rows and statements that were already applied).
When parallel apply in enabled, there will be one applying field per channel configured, for example the following shows 2 channels:
... applying.0 : applying.1 : 25 / 0 (92.86%) ...