The upstream binaries for Sparky in Debian has entered the "Hard Freeze" stage, actually some time ago.
It is a decent working hypothesis or maybe just a guess that it will take longer than usual to achieve the release of "Bullseye" as the new stable to replace the present "Buster."
QuoteKey release dates
[2021-01-12] Transition and (build-)essential Freeze
[2021-02-12] Soft Freeze
[2021-03-12] Hard Freeze - for key packages and packages without autopkgtests
[ TBA ] Full Freeze
As of May 02
NO release-critical bugs were closed and 2 were opened.
Opened/upgraded release-critical bugs
A short look at the critical packages shows things needing some love and more than a few final python 3 fixes needing to be done. In these times where some parts of the world are reeling current events, it is to be expected that the labour of love that is free open sourced software would slow its pace.
Keep safe all.