DD started when she was 9 months, she's 10yo now so it was a few years ago and changed as she got older.
She'd go in first thing and generally there would be a breakfast time where they'd sit and have cereal or toast while all the kids trickled in, any kids not eating would play and there would be staff in the room on hand if any needed help or to get handover from a parent.
They had free range to be in or outside so there were always some staff inside doing short activities like messy play, crafts, I'll call it cooking but it was usually something like splatting icing on mcvities digestives, splashing in the water trays, moving sand around with little buckets. Then there would be some staff outside watching while the kids used the trikes, scooters, slide/obstacle course, sandpit, big wooden blocks etc.
There would be certain times when they'd all be bought back in for a snack or to try for a nap, or for lunch/dinner. They also had routines like all of them brushing their teeth after lunch (EYFS requirement).
The staff also need to document the kids learning at points so will take photos, or do little assessments (like games) to see if they are meeting their EYFS milestones, update their records and to work towards the qualifications the staff need to obtain and keep updated.
Remember that everything takes longer when you're dealing with kids en mass, so while sitting for lunch might be a 20 min job at home, it can take 15 mins just to get all of them in the same space, with bibs on, sat down and ready for food, then when the food is bought out there's lots of distractions, then they al need their faces wiped and bibs off, so lunch turns into an hour or so of activity.