Scheduled posts are an incomplete solution that don't meet the needs of users who curate a feed with boosts in it. Scheduled boosts are perhaps the feature I miss most when switching from Fedilab.

Describe the solution you'd like

Being able to long-press the boost button and select Schedule Boost, similar to Fedilab.

Describe alternatives you've considered

Third-party scheduling apps typically don't support this, and even if they did, would either require support from clients like Moshidon, or be clunky to use at best.

Additional context

One reason the Tumblr ecosystem remains vibrant even with a greatly reduced userbase from its peak is because it has rich features for scheduling (and queueing, and drafting) boosts/reblogs.