As Virtual report suite is defined and designed based on actual report suite id (with Segment), I don't think is is feasible to check if there would be any server calls usage you would be able to measure.
Switching to virtual reports suites itself remove the necessity for secondary server calls. this allows simplify analytics implementation and reduce server call consumption, and that is the best practices.
However you can still able to see the Server call consumption for your actual report suites. Here is the reference link
Hey @deepakkv - Virtual Report Suites do not use any server calls.
A virtual report suite (VRS) uses segments . Data is sent to one report suite, then is divided according to segments - so there is no server call usage and hence no report is available for this.