I watched a video recently where people were complaining that if they started work at 9am, 3pm what ever it might be that they will turn up on the dot if their boss expects them to be there earlier they need to pay them more.
I do agree, as apparently some places ask you to arrive 15mins early for a seamless cross over. Which could actually work out at nearly 60 unpaid hours over the year.
I have been bang on time arriving to work and would not consider myself late but I had 1 boss who would consider that late and she made sure I knew.
But if you want to get in, get a cuppa tea, say hi to people you aren't arriving 10 mins early to actually start work. I have worked with people who come in at 9am on the dot, then go to the kitchen for 20 mins before even turning on the computer.
I wfh now so I do tend to start a bit earlier then my official start time