This came up on another forum and I thought I'd throw this out here for consideration.
When returning from France last month we spent most of the night before in our hotel room scanning and uploading documents to Delta proving that we were fit to fly (and nowadays there are many, many documents). We also had to forward forms to the front desk to have them printed out for us. Without a comfortable environment and reliable internet (not to mention our various cellphones and tablets), we would have been doomed. Especially because there's something about my wife's CDC card that does not scan well or isn't received well and it took many tries. We also took comfort in knowing that, worst case scenario, there was a computer and printer available downstairs in the business lounge.
So make sure that, in addition to arranging the tests you need to come home, you also allow for all the paperwork you're going to have to deal with. As they say, hope for the best but plan for the worst. Yet another reason we chose to spend our last night in an airport hotel with all the modern conveniences and a short walk to our terminal in the morning.