Time collapse:
"Probably won't last another day"- over 25% of it's total time remaining.
"Reaching the end of its natural lifetime" - less than 25% of it's total time remaining. Collapse is imminent.

Mass collapse:
"Has not yet had its stability significantly disrupted" - This indicates the wormhole is still quite stable, and has over 50% of its total allowable mass left.
"Has had its stability reduced, but not to a critical degree yet" - This means the wormhole has less than 50% of its total allowable mass left.