Play date for 5 yo- do I have to stay?

[OneKeyAtATime]

My eldest (5 yo) has been invited for a playdate at a friend's house. Because of the pandemic it's the first time this has happened as normally we would arrange for kids to meet outdoors, in a park somewhere, etc. or the last few weeks it was birthday parties at someone's house but because if the rule of 6 parents were expressedly told not to stay.
Am I expected to stay at theirs or is it a drop off sort of situation ? I know my child would be fine without me but I am unclear what the etiquette is. I am not even sure whether it would be considered rude to stay or to go! And I feel rude to ask either way as it could sound like I don't want to stay or conversely that I am imposing.
My child is 5 (reception), has once been to this friend s house for his birthday. To my knowledge only my kid is invited. I have met the mum before.

Play it by ear? Or just ask. The parent may appreciate the company, or be glad her child's occupied so she can do stuff.

Generally I’d say reception stay (first time only) and year one leave but just ask the other parent what they think. If the child is happy with the arrangement then generally fine to leave.

As per pp just ask is a casual way 'do you fancy company, or shall I pop back for her later?'

Is the playdate after school? If so I’d assume child goes solo as they are picked up from school by the other parent. I think I used to arrive “early” for pick up - like 5 if the playdate ended 5.30 - just to get to know the other parent and in case the playdate was wearing thin.

If not after school I think I’d stay for a cup of tea at drop off, then head off.

Is the other child a younger sibling? If so then IME it will be expected to be a solo playdate.

Ask the parent