You can send out a note from zap stream, but I don't know whether you can schedule it. For something like that, you'd use nostr:nprofile1qqsgtssdxasw7nsewcr3545lkd3lflcgdj5swe5lh9gk0nw9xpvnf5gppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnwdaehgu3wvfskuep0qyfhwumn8ghj7mmxve3ksctfdch8qatz9unyl3np