The pace bowler has secured 309 wickets in 71 five-day games with an average of 22.10.
The Australian chief selector the selector has declared that skipper Cummins will play a "major part" in this winter's Ashes series.
Rumors had circulated that the veteran bowler might miss the series due to a persistent back stress problem that had not yet healed.
Previous updates from the Australian camp suggested no definitive call had been made regarding Cummins' participation, with the Test matches set to start on 21 November in Perth.
Bailey expressed that Cummins is "building up" and felt positive about his chances of taking part.
"It's clear that time is getting short and multiple considerations at play, not only the physical problem, but further aspects," he commented.
"The outlook is good. We firmly believe that he will feature a major part. Ideally from the opening match. If not, then we'll pick it up."
Previous Setbacks
Cummins was ruled out the ODI and T20 games against New Zealand and India recently after medical tests showed a lumbar bone stress.
Previous incidents include of recurring issues, with setbacks in several earlier campaigns forcing him out of three Australian summers in four years.
The bowler mentioned he would be proactive in his approach in his comeback strategy to secure his spot for the Ashes.
Bailey noted that it was unclear if Cummins had begun bowling as part of his comeback but acknowledged it was "becoming urgent" for him to regain fitness for the first Test.
Alternative Arrangements
In case of absence, veteran batsman Smith will assume leadership.
All-rounder Cameron Green was recently pulled out from the ODI lineup for their ODI contests against India as a precautionary measure because of discomfort in his torso.
Bailey described it as a "slight concern and confirmed that he's scheduled to appear in the domestic first-class competition, so will be "in a good place to resume bowling."
"Extensive planning has gone into creating the schedule for him to be available for the opening match as an dual-role player," he elaborated.
"He was only going to play the first two ODIs anyway. The way he swings the willow in shorter formats, even if it just sets him back for a short period, the choice was made to adopt a safer strategy."
Match Calendar
Australia vs England: The Ashes
Spanning from late 2025 to early 2026
