If you haven't yet done so, I would go to Drake's support site, and under "Reports," print out the "E-file Detail Lookup Report ." That report is more detailed than what is available through the software. For Federal and each state return, it shows the time stamp, its e-file status, the e-file submission i.d., and the DCN. The submission i.d. is unique to each return, so CA's identifier will be different than the federal or any other states for the client.
Because by Monday you will be beyond the 5 day correction period for rejected e-files, that report would prove that e-filing was done timely, because if you end up resubmitting the e-file for some reason, it is my understanding that a new e-file submission i.d. is generated and that may make it appear as if these returns were filed late.
If you don't have acks by Monday, I also think you should escalate this to a higher level with Drake than with those that provide basic telephone support. There were other years where posts here indicated a delay of 2-3 days immediately after the deadline, but this seems too long to me.