As you have correctly stated, the editor has probaly not yet had time to look at the reviews, which is why the status is still showing "Required reviews completed." However, you have nothing to worry about. It is quite normal for the status to remain unchanged in this stage for a week or two. This is because the editor probably has a few papers already lined up before yours. Once he/she is done with those, you will surely see a status change.
It is too early to write to the editor about this. You should wait for at least 2-3 weeks. If you still don't see any change, you can send an inquiry. All the best!
Related reading:
- How long does a paper remain at the 'Decision in Process' status?
- How long does 'Decision in process' take for Paddy and Water Environment Journal?
