You inherently have the relief per 91.117 (d), it was more of a notification to ATC (AIM 4-4-12 i ) unless the SID prescribed 250 kts (or something below that) procedurally, in that case you would be requesting relief (not for 250 below 10 but the specific procedure aka the O’Hare 7 ie “maintain 250 it until advised by ATC” if you want to get nuanced).