Is my federal taxes done and sent

No one can see your account.    Did you click a big orange button that said "Transmit my returns now?"   If you did that, then you e-filed.   But since the IRS will not begin to accept/reject e-files until January 24 you are not going to know until then whether your return has been accepted.

MY RETURN IS IN PENDING—what does that mean?

Did you e-file?  Did you click that big orange button that said “Transmit my returns now?”  If so, your return is now in “pending” on a server.  Do not try to change anything while your return is in pending. By January 24 the IRS will begin to accept/reject e-files.   If your return is rejected you will be able to make corrections before re-filing.   If the return you e-filed is accepted you will have to wait until it has been fully processed and then amend it to fix  mistakes.