Op if you are working and she is at home then she should be making dinner. You should make this clear to her. Then don't cook, go upstairs, have a shower and say hi to the children. Let her do the dinner, and refuse to engage.
From your other posts it seems to be me like you are not being clear, loud or assertive enough. Mumbling you will leave because of the phone is not direct enough.
Sit her down and tell her clearly that you have felt so low as to feel suicidal and you can not continue like this. Have a short list of the things that upset you most, and the solutions to them.
Share the list with her, and ask her directly if she is willing to make some changes or not. If she is, you have something to work with. If she is not, then you have no option but to leave and start a trial separation.
If she is lazy the last thing she will want is for you to leave.
Your emotional and intimate needs should follow when the phones are turned off. After 4pm is brilliant idea (we do that too) although ours is after 5.30pm. Talk, have dinner, book a babysitter go out.
You are in a rut, and it is possible to escape with your family intact, but you need to be more open and honest about your feelings with her.
Lockdown would have made this all feel worse, once the dc are back in school it should get better.