I don’t know football. In our experience, if a D3 coach was interested, the athlete was invited for a visit in the spring, summer, or early fall of application year. During the visit, there were meetings with teammates and coach and an interview with admissions.
During the process, the coach got transcripts and academic info to give to admissions for a pre-read to make sure the athlete would qualify for admission. Assuming the coach wants an athlete, the coach will encourage the athlete to apply ED and tell admissions.
Admissions will review the application like that of a regular applicant, but knowing the team wants the athlete to fill an institutional need. That is a huge advantage in getting admitted and receiving the highest merit scholarships over other similar applicants. (It is a “hook” that makes the athlete stand out among other applicants with similar applications all vying for the same spots.)
At this date, you are very late in the process. By the time you are on a coach’s radar, the ED deadline may have already passed, so they may be fine with you applying ED2 or RD if they want you. Your best bet is finding a team who didn’t get a quarterback they wanted and has a hole to fill. Maybe your high school coach has some leads.