That's great. I love hearing about how things are almost back to normal now. I have been quite cautious and so it was a big deal the other day when I went out for a meal - first time since Jan/Feb time. It was great!
I didn't find any checklist for a review paper. I am thinking I will probably develop my own now that I have done this review.
I did find the following links useful in addition to the one you recommended:
The second link was really useful as it had different researchers sharing their experiences about how long they usually take, any strategies they use, etc.
I think it is good that multiple reviewers are invited, as there were a couple of things (not vital or pertaining to inaccuracies) I didn't bother suggesting as I felt I'd made enough comments. I thought oh well, maybe another reviewer or the editor will suggest them if they think they are important...