CRAN budget: (max six existing release on CRAN last 180 days)
2021-11-21: 1.29.0
2021-09-09: 1.28.1
2021-07-19: 1.27.0
2021-06-30: 1.26.1
2021-06-09: 1.26.0
2021-04-30: 1.25.0

pkg <- "parallelly"
(now <- Sys.time())
#> [1] "2021-12-14 17:16:07 PST"
since <- now - rbind(tools:::CRAN_archive_db()[[pkg]], tools:::CRAN_current_db()[pkg,])$mtime
sum(since <= 180)
#> [1] 4

See also https://gist.github.com/HenrikBengtsson/464b181dce49cdb82d5bdec160a498d8