Does the SMTP relay handle DMARC aggregate reports, or do you still need something like parsedmarc set up alongside it? That's always the loose end when I put these together.
Parsedmarc is still the right tool if you want to self host reporting, otherwise you should look into solving this with your provider. Explicitly trying to avoid dealing with all the operational costs of running a mail server, just trying to enable email capabilities in apps that need it so it's beyond the scope of what I built here.