For time collapse:
"Life cycle has not begun"
"Probably won't last another day" - over 25% lifetime
"Reaching the end of its natural lifetime" - under 25% lifetime


For mass collapse:
"Has not yet had its stability significantly disrupted" - over 50% mass
"Has had its stability reduced, but not to a critical degree yet" - under 50% mass
"This wormhole has had its stability critically disrupted by
the mass of numerous ships passing through and is on the
verge of collapse." - less than 10% mass