I had dbl mast in May 2025. I got some sports bras zip front that were recommended by the surgeon. Honestly, the hospital charges enough, they should have supplied rather than sending me off with a list of things I needed to buy. I was supposed to sleep in them to provide compression for the first week or two. They were miserably tight. If you are asked to seek them out, I had to get them from Walmart Avia brand, very weird color availability at our rural store. Get a size you think you could sleep in and wear all day, which means MUCH larger than your normal size. I ended up getting bras from AnaOno (online). Their front hook and loop bras are MUCH softer and more comfortable!
Also, don't sit around too much...take frequent short walks around, even if it means in the house. I didn't think I could do stairs, so I brought up all my sewing machine supplies and project to my main floor office next to the bedroom. In hind sight, I didn't need to do that, as I was fine. You might be different, but I was able to do stairs. Sleeping is not fun if you are a side or stomach sleeper, as you will want to sleep on your back until you can roll over. Support from king sized pillows helps, and one under knees to keep you from rolling. I spent half the night in bed propped with pillows, half in the recliner. That was probably my better sleep, in the recliner.

You will be able to do way more than you thought you would. People brought over food, and I was actually embarrassed, because I felt I could cook for my husband and I if he helped me lift the heavier stuff (they won't want you to lift more than 10#s or so, both arms.

Hope this helps! Best wishes. Don't worry, the healing happens really faster than you might think.