diff --git a/src/SimulationService.jl b/src/SimulationService.jl
index 17a44bf..6f6e84d 100644
--- a/src/SimulationService.jl
+++ b/src/SimulationService.jl
@@ -431,7 +431,7 @@ end
 function publish_to_rabbitmq(content)
     if !RABBITMQ_ENABLED[]
         # stop printing content for now, getting to be too much
-        @warn "RabbitMQ disabled - `publish_to_rabbitmq`" # with content $(JSON3.write(content))"
+        @warn "RabbitMQ disabled - `publish_to_rabbitmq`" #with content $(JSON3.write(content))"
         return content
     end
     json = Vector{UInt8}(codeunits(JSON3.write(content)))
diff --git a/src/operations.jl b/src/operations.jl
index 354857c..fba0f16 100644
--- a/src/operations.jl
+++ b/src/operations.jl
@@ -183,19 +183,6 @@ mutable struct IntermediateResults
         new(0, every, id, 0)
     end
 end
-
-function (o::IntermediateResults)(integrator)
-    (; iter, f, t, u, p) = integrator
-    if o.last_callback + o.every == iter
-        o.last_callback = iter
-        state_dict = Dict(unknowns(f.sys) .=> u)
-        param_dict = Dict(parameters(f.sys) .=> p)
-        publish_to_rabbitmq(; iter=iter, state=state_dict, params = param_dict, id=o.id,
-            retcode=SciMLBase.check_error(integrator))
-    end
-    EasyModelAnalysis.DifferentialEquations.u_modified!(integrator, false)
-end
-
 # Intermediate results functor for calibrate
 function (o::IntermediateResults)(state,loss_val, ode_sol, ts)
     if o.last_callback + o.every == o.iter
@@ -234,10 +221,25 @@ function get_callback(o::OperationRequest, ::Type{Simulate})
     DiscreteCallback((args...) -> true, IntermediateResults(o.id,every = 10))
 end
 
+function (o::IntermediateResults)(integrator)
+    (; iter, f, t, u, p, sol) = integrator
+    t_end = sol.prob.tspan[2]
+    percent = round((t/t_end)*100.0, digits = 2)
+    if o.last_callback + o.every == iter
+        o.last_callback = iter
+        #state_dict = Dict(states(f.sys) .=> u)
+        #param_dict = Dict(parameters(f.sys) .=> p)
+        publish_to_rabbitmq(;id=o.id,
+            retcode=SciMLBase.check_error(integrator), percent = percent)
+    end
+    EasyModelAnalysis.DifferentialEquations.u_modified!(integrator, false)
+end
+
+
 # callback for Simulate requests
 function solve(op::Simulate; callback)
     prob = ODEProblem(op.sys, [], op.timespan)
-    sol = solve(prob; progress = true, progress_steps = 1, saveat=1, callback = nothing)
+    sol = solve(prob; saveat=1, callback = callback)
     @info "Timesteps returned are: $(sol.t)"
     dataframe_with_observables(sol)
 end
diff --git a/test/runtests.jl b/test/runtests.jl
index 1eb5a2e..ab8d403 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -206,7 +206,9 @@ end
         obj = SimulationService.get_json(json_url).configuration
         sys = SimulationService.amr_get(obj, ODESystem)
         op = Simulate(sys, (0.0, 99.0))
-        df = solve(op; callback = nothing)
+        call_op = OperationRequest() # to test callback
+        call_op.id = "1"
+        df = solve(op; callback = SimulationService.get_callback(call_op,SimulationService.Simulate))
         @test df isa DataFrame
         @test extrema(df.timestamp) == (0.0, 99.0)
     end