Thank for giving me some insight into what a singer has to do in order to sound so wonderful :-)
You are almost a week out from your laser treatment and, as such, the laser "welds" are getting fairly strong right now.
In my opinion, after having practiced retina for almost two decades now, you are safe to sing soprano, even for an extended time period, at this point.
There should be no worries about changes in intraorbital, intraocular
pressure or vibrations affecting your laser treatment at this point.
Of course, should you start to see an increase in your floaters, new flashes of light or a curtain coming across your visual field from any direction, get in to see your ophthalmologist
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Break a leg :-)