There is no way to tell exactly what a CSAA is building unless you are a member of the corporation and you have been blessed with the roles necessary to use building arrays at a POS. Any supercapital builder worth his or her salt will likely be in a small corp with only his or her building alts, so that’s not an option.
That supercapital builder, however, is likely in your alliance, and you can quickly determine if /something/ is building using the Science & Industry tab. This requires no roles whatsoever, so even your aw0x'ing alt who is about to get kicked can still check this out, \o/.
Fire up S&I, then go to the “Installations” tab, and then sort by Activities —–> Manufacturing, and Type —–> Alliance, and Prod. Category —–> Ships.
Then check for arrays named CSAA and/or arrays that only have one build slot (a smart builder will rename his or her array to something entirely different than CSAA to help disguise it on the Science & Industry tab). If the jobs are well over 2 weeks long, it is most definitely a supercapital build. If there’s only a few days left, it’s harder to say with any degree of certainty, but unless you’re IT Alliance building ~components~ in your CSAA, then it’s highly, highly unlikely that it is anything but a supercarrier or titan build. And if, ofc, the job is 40 days long, well, ding ding ding, you have a titan building, sir!