Oncidium Sharry Baby bursting out of its pot

[Mulchlady]

I just purchased a beautiful Oncidium Sharry Baby. It has a wonderful flowering stem and another stem waiting to burst into bloom.

It is a very large plant in a teeny tiny pot with roots going wild all over the place. I mean, roots are growing outside the pot everywhere! Since it's in flower and this is not the time of year to repot it, I don't know what to do. I tried to post a picture, but I can't seem to get it to work.

Should I just wait till it finishes flowering to repot? And, do I cut off all the roots that are growing outside of the pot? I'm afraid I'll do the plant harm if I cut so many roots. Please help.