How do I set a progress Indicator next to a button?

Question

I want to add a progress loading indicator next to or ontop of a button as shown below in the screenshot. I've tried Row which works but still has some issues. I've tried Stack but when I add the loading bar it seems to disappear on me. Any suggestions?

loading indicator next to button

---

                  SizedBox(
                    width: double.infinity,
                    height: 150,
                    child: Container(
                      child: Stack(
                        fit: StackFit.passthrough,
                        children: <Widget>[
                          Container(
                            decoration: const BoxDecoration(
                              image: DecorationImage(
                                image: AssetImage(
                                    "assets/background_large_gradient.png"),
                                fit: BoxFit.cover,
                              ),
                            ),
                            child: OutlinedButton(
                              child: boatLiftImage,
                              onPressed: _pressedBoatRemote,
                            ),
                          ),
                          Align(
                            alignment: Alignment.centerRight,
                            child: Padding(
                              padding: EdgeInsets.fromLTRB(0, 0, 40, 10),
                              child: Text(
                                '50%',
                                style: TextStyle(color: Colors.white),
                              ),
                            ),
                          ),
                          Align(
                            alignment: Alignment.centerRight,
                            child: Padding(
                              padding: const EdgeInsets.all(10),
                              child: Container(
                                child: RotatedBox(
                                  quarterTurns: -1,
                                  child: ClipRRect(
                                    borderRadius: BorderRadius.all(
                                        Radius.circular(10)),
                                    child: LinearProgressIndicator(
                                      minHeight: 20,
                                      value: 0.5,
                                      valueColor: AlwaysStoppedAnimation(
                                          Colors.blue),
                                      backgroundColor: Colors.white,
                                    ),
                                  ),
                                ),
                              ),
                            ),
                          ),
                        ],