> Unfortunately my 30-days grace period ends on September 26th.
Ok, so unless you manage to get another DS2091 until monday, you are in trouble.
> I applied to the school this week.
Will they be able to get a DS2091 for you today ? Otherwise beeing at school doesn't help you.
> my DS2019 shows that I'm not subject to Home Requirement
> Residency, but there is no note on my visa, which is for 5 years (J-1)!!!
Most likely, you will need an 'advisory opinion' from the department of state to determine whether you have a HRR.
This is I believe a free service, but it takes at least a couple of weeks to come back.
> I'm going to the interview and maybe they won't check it.
> Is it possible? Please reply.
I am still puzzled why you think that this can be fixed on a friday afternoon, less than 48hrs before your grace period ends..
Checking for an unfullfilled J1 home residency requirements is an established part of the I485 process, you will need a lot of luck for them to just overlook the note on the visa stamp.
I wish you the best of luck