This is a serious situation and worth acting on today, not tomorrow.
A Type 1 diabetic with a foot infection and a fever of 101 is not a routine medical situation. Diabetic foot infections can escalate rapidly and become life-threatening if not treated aggressively. The fact that antibiotics were ordered but have not arrived yet is a gap that needs to close quickly, and you are right to be concerned.
Call the facility now and ask to speak with the medical department or the health services administrator. If you cannot reach medical staff directly, ask for a lieutenant or the duty supervisor and explain that you have a family member with Type 1 diabetes who has a documented foot infection and elevated fever and that ordered medications have not yet been administered. Be specific, be calm, and be clear about the urgency without escalating the tone into a demand.
The approach matters. Staff who feel attacked or accused become defensive and less helpful. Staff who hear a composed, genuinely worried family member presenting specific medical facts respond very differently. Your most humble and cooperative version of yourself will get further than anger, even when anger is completely understandable.
If you do not get a satisfactory response through the facility, the next step is contacting the state's department of corrections oversight office or the facility's health services contractor directly. Many state prison systems contract with outside medical providers who have their own administrative contacts separate from the correctional staff.
Document every call you make, who you spoke to, what time, and what they told you. If this situation deteriorates and legal action becomes necessary, that record matters.
Do not wait on this one.