Depending on the crime, you will need to see if he is eligible to be detained at all. If ICE does not hold him, you may pick him up. However, there is a high probability that he will be detained and at that point you will need to contact an attorney to help you obtain a bond and see if there is any relief for him.
If I understand correctly, you are asking what will happen if ICE does not pick him up within 48 hours. In this case, the correctional institution will in all likelihood let him go. In some instances however, they try to arrange for ICE pick up once again before doing it. In most, ICE does pick up within 48 hours thus resolving the guessing game before it even happens.
Most of the time, especially if a person was detained for relatively short time, ICE will pick them up. The jail will make arrangements for the ICE agents. If the person is not picked up, she/he will be free to go. However, I recommend you consult with an immigration attorney to develop a plan and see what can be done in either situation. Good luck.
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If there is an ICE detainer placed on the system, he will most likely be picked up within 48 hours of his release from State jail. If ICE does not show up within such time, the State must let him go. If they refuse to do so, you may file a habeas corpus with the court to have him released.
This answer does not create an attorney-client relationship and should not be relied as legal advice on your case. You may call my office at (832) 305-5382 to schedule a consultation if you require specific legal advice. Law Offices of Hector J. Lopez. 1201 South Shepherd Dr. Houston, TX 77019. www.hjlopezlaw.com