Comichron did a projection of the Future State books sales:
January 2021 Superman related books ranking
14 - Future State Superman of Metropolis #1
17 - Future State Superman Wonder Woman #1
19 - Future State Superman Worlds of War #1
23 - Future State Batman Superman #1
27 - Future State Suicide Squad #1 (feat. Conner)
28 - Future State Legion of Super-Heroes #1
32 - Future State Kara Zor-El Superwoman #1
34 - Legion of Super-Heroes #12
35 - Future State Superman Vs Imperious Lex #1
Source:
https://www.comichron.com/monthlycom...2021-01DC.html
February 2021 Superman related books ranking
13 - Future State Superman House of El #1
15 - Future State Superman of Metropolis #2
17 - Future State Superman Worlds of War #2
20 - Future State Superman Wonder Woman #2
21 - Future State Batman Superman #2
29 - Future State Legion of Super-Heroes #2
30 - Future State Suicide Squad #2
31 - Future State Superman Vs Imperious Lex #2
33 - Future State Kara Zor-El Superwoman #2
Source:
https://www.comichron.com/monthlycom...021-02DC.htmlp