In our firm around 80% of staff have been in all the time since March.
This is mainly due to the nature of our product. Flour, despite our plant being fully PLC controlled there are so many things that require human intervention so no choice but to have staff in. The Admin side was WFH for about 3 months but seeing as we have a large office and a 10th of the staff it was designed for separation/space isn’t an issue.
At first I was doing 3 days in and 2 at home but at any time I could be called in and most of my tasks as Engineering manager means you need to be on site.
I mostly hated the WFH as I was covering the early start at 6am yet still having to field calls etc at 6pm. Plus being on 24/7 call every 4 weeks was stressful as you can normally head off certain issues if you are on site.
I think it was @DezB that said it was very lonely if your on your own, though I can see from others posts having others around, I know my sister in law and husband found it hard work.