1 workflow start with the n8n form submission, and for every submission, keep the data in a google sheet or something similar
the other workflow uses the schedule trigger and to check the submission that happens on that certain time and process it, and after its done processing you need to have like a status field that you can change into like “Done” so it will not be executed again
this google sheet will have the field of the field that you have in your form + the created at/submitted at field for keeping track on when its submitted + the status field “Added” or “Done” to keep track of wether its done processing by the 2nd workflow or no