After much deliberation, Sapparis, a name you will become familiar with on this forum, has decided the following rewrites will work:
With reference to our telephone conversation earlier this month, that web site process takes three weeks and should be delivered to me on time.
or
With reference to our telephone conversation earlier this month, the completion of that web site is three weeks away but should be delivered to me on time.
If this is not what you wish to convey, then please tell us.