You should have received very specific advice on this prior to discharge. Please contact your cardiologist or the physical therapist who should have advised you in the hospital. For me, I think it was 5 lbs up to 8 weeks. Then it was lifted gradually over the succeeding few months. I was told clearly that after full recovery (something like 6 months) I would have NO exercise restrictions at all, period. Just what is safe for you when needs to be directed by your medical providers. But, off the cuff, 10 weeks would seem too early for pushups. Eventually you should be able to do whatever you want, but no one here can speak to your specific case.