You need to set your own boundaries, and people will start to respect them. I work in an industry where it’s normal to work 9am-10pm or even later on occasion, but we all have a chat at the start of the project and share our personal boundaries e.g. I prefer to start early in the mornings and not work late, I prefer to have a long lunch break, I’d rather work on the weekend but finish early on Friday etc. And we agree rules such as if it’s after 6pm you’ll call someone if it’s urgent, otherwise assume they won’t respond until morning. Try and set this culture at your office. Particularly the phone if urgent rule - easy to put in place as you have the excuse that you’ll be cooking dinner and eating at some point so might miss it.
Now we’re working from home it is also the same. You need to remove your own expectations to check things too. If I finish at at 6 for example I just check my emails maybe once at 8pm and once at 10pm BUT I’ll only reply if it’s super urgent, not just random stuff that can wait. Although it can be handy if you’re worried about face time to reply to a few random quick things...So it’s up to you as well as your team. It will feel tough the first few days then you’ll realise the world won’t fall apart.
Also turn notifications off on your phone. Including the little red badges. That way you won’t be tempted to look at your emails/slack etc every time you pick up your phone outside of office hours. Again, at first it will feel scary “what if I miss something?!” But you’ll realise within a few days that actually, you won’t, and especially if people know to call you for urgent stuff that then you don’t even need to worry. I turned off my notifications when I was on holiday a couple of years ago, and when I came back was quite nervous but experimented with keeping them off and it’s fine, really.
Also agree that weekends are sacrosanct and you will only work if the world will end.
I work in a crazy business with lots of work obsessed people but the above rules make your life manageable, and unless you are an absolutely career obsessed individual you’ll also realise that the tiny risk of someone feeling you’re not pulling your weight is worth it.