Unclear when the filter command has finished printing projects

[connorhsm]

Is your feature request related to a problem? Please describe.
As there is rate limiting when posting projects using the !filter command, it's unclear when or if the bot has finished posting projects.

Describe the solution you'd like
An embed message notifying that all matching projects have been displayed, deleting itself after a substantial amount of time such as 30 seconds.

Describe alternatives you've considered
None

Additional context
None