先ほどから
Meanings
1
since some time ago; for a while now
Indicates that a state or action has been continuing from a point in the recent past up to the present. Often used when the speaker has just noticed or wants to emphasize the duration.
See also: 先ほど (さきほど)
It has been raining for a while now.
I didn't notice the phone had been ringing for some time.