How many days after a tooth extraction and implant can you safely eat more than just liquid or soft food. How long for the external wound to heal?

Ask your dentist. It is always best to ask the dentist who actually performed the surgery. He or she knows more about the specifics of your surgery than any doctor online. Having said that, in general, you can eat the same day, but should favor the other side. The external wound should heal in about a week or two but again depends upon the method of surgery etc.
Extraction. The day tooth is extracted , one can eat soft food and on opposite side of extraction side.Next day can eat everything however need to rinse the mouth . The wound takes atleast 4 to 8 weeks to heal depends upon the mobility of teeth and health and age of patient.