Question

[Scarlet]

How do I say in Spanish - I need to know, in writing, that the deed has been submitted.

[Spanish Teacher]

¡Hola!

You can say:

I need to know=necesito saber,
in writing=en escritura(literal), al escribir(figurative).
that the deed has been submitted=que la obra ha sido enviada o remitida.

Greetings from Puebla. Bye!