Technically Christians can meet any time, anywhere, as Christ is our Sabbath. But it is straight out incorrect to allege that Christians have not been meeting on the Lord's Day, Sunday, for almost 2000 years, to break bread and to worship.
Breaking bread does not indicate worship. It’s the only way those loaves could be eaten, as they were simply lumps of dough.
It is also incorrect to assert the change has a divine basis, which it does not. The change was largely because of unconverted people reaching high church office who made the change to obtain political favour from pagan authorities and to make a clear separation from the Jewish faith to avoid prosecution.